Update plugin shadowjar to v9

* add reportSyncEvent

* Update SyncYomiSyncService.kt

.editorconfig

@@ -11,4 +11,8 @@ ktlint_standard_if-else-wrapping=disabled
 ktlint_standard_no-consecutive-comments=disabled
 
 [**/generated/**]
-ktlint=disabled
+ktlint=disabled
+
+[*.json]
+indent_size=2
+indent_style = space

.github/workflows/wiki.yml

@@ -24,6 +24,8 @@ jobs:
         with:
           repository: ${{github.repository}}
           path: ${{github.repository}}
+          fetch-depth: 0 # fetch history & tags to determine stable version
+          fetch-tags: true
 
       - name: Checkout Wiki
         uses: actions/checkout@v6
@@ -37,7 +39,7 @@ jobs:
           cd $GITHUB_WORKSPACE/${{github.repository}}.wiki
           cp -r $GITHUB_WORKSPACE/${{github.repository}}/docs/* .
           
-          stable="$(git describe --abbrev=0 --tags)"
+          stable="$(git -C $GITHUB_WORKSPACE/${{github.repository}} describe --abbrev=0 --tags)"
           if ! git -C $GITHUB_WORKSPACE/${{github.repository}} log --exit-code --pretty= "$stable.." -- docs/Configuring-Suwayomi‐Server.md; then
             echo "Changes to config detected, embedding link to stable"
             sed -i '1s/^/> [!WARNING]\n> This document describes the settings available in the preview version. Please head to ['$stable'](https:\/\/github.com\/Suwayomi\/Suwayomi-Server\/blob\/'$stable'\/docs\/Configuring-Suwayomi%E2%80%90Server.md) for the current stable version\n\n/' Configuring-Suwayomi‐Server.md

AndroidCompat/src/main/java/xyz/nulldev/androidcompat/webkit/CefHelper.kt

@@ -21,7 +21,7 @@ object CefHelper {
     }
 
     fun waitForInit() =
-        callbackFlow<CefApp> {
+        callbackFlow {
             val app = cefApp.first { it.isFailure || it.getOrThrow() != null }.getOrThrow()!!
             app.onInitialization {
                 logger.debug { "CEF: Initialization state $it" }

AndroidCompat/src/main/java/xyz/nulldev/androidcompat/webkit/KcefWebViewProvider.kt

@@ -68,6 +68,7 @@ import org.cef.handler.CefLoadHandler
 import org.cef.handler.CefLoadHandlerAdapter
 import org.cef.handler.CefMessageRouterHandlerAdapter
 import org.cef.handler.CefPermissionHandler
+import org.cef.handler.CefRenderHandlerAdapter
 import org.cef.handler.CefRequestHandler
 import org.cef.handler.CefRequestHandlerAdapter
 import org.cef.handler.CefResourceHandler
@@ -82,10 +83,13 @@ import org.cef.network.CefPostDataElement
 import org.cef.network.CefRequest
 import org.cef.network.CefResponse
 import org.koin.mp.KoinPlatformTools
+import java.awt.Rectangle
 import java.io.BufferedWriter
 import java.io.File
 import java.io.IOException
+import java.nio.ByteBuffer
 import java.util.concurrent.Executor
+import javax.swing.JPanel
 import kotlin.math.min
 import kotlin.reflect.KFunction
 import kotlin.reflect.full.declaredMemberFunctions
@@ -97,6 +101,7 @@ class KcefWebViewProvider(
     private val settings = KcefWebSettings()
     private var viewClient = WebViewClient()
     private var chromeClient = WebChromeClient()
+    private val renderHandler = RenderHandler()
     private val mappings: MutableList<FunctionMapping> = mutableListOf()
     private val urlHttpMapping: MutableMap<String, String> = mutableMapOf()
     private var initialRequestData: InitialRequestData? = null
@@ -522,6 +527,21 @@ class KcefWebViewProvider(
         }
     }
 
+    private class RenderHandler : CefRenderHandlerAdapter() {
+        override fun getViewRect(browser: CefBrowser): Rectangle = Rectangle(0, 0, 1280, 2856)
+
+        override fun onPaint(
+            browser: CefBrowser,
+            popup: Boolean,
+            dirtyRects: Array<Rectangle>,
+            buffer: ByteBuffer,
+            width: Int,
+            height: Int,
+        ) {
+            // do nothing
+        }
+    }
+
     override fun init(
         javaScriptInterfaces: Map<String, Any>?,
         privateBrowsing: Boolean,
@@ -617,7 +637,7 @@ class KcefWebViewProvider(
             kcefClient!!
                 .createBrowser(
                     loadUrl,
-                    CefRendering.OFFSCREEN,
+                    CefRendering.CefRenderingWithHandler(renderHandler, JPanel()),
                     false,
                 ).apply {
                     // NOTE: Without this, we don't seem to be receiving any events
@@ -642,7 +662,7 @@ class KcefWebViewProvider(
             kcefClient!!
                 .createBrowser(
                     url,
-                    CefRendering.OFFSCREEN,
+                    CefRendering.CefRenderingWithHandler(renderHandler, JPanel()),
                     false,
                 ).apply {
                     // NOTE: Without this, we don't seem to be receiving any events
@@ -676,7 +696,7 @@ class KcefWebViewProvider(
             kcefClient!!
                 .createBrowser(
                     url,
-                    CefRendering.OFFSCREEN,
+                    CefRendering.CefRenderingWithHandler(renderHandler, JPanel()),
                     false,
                 ).apply {
                     // NOTE: Without this, we don't seem to be receiving any events

CHANGELOG.md

@@ -7,7 +7,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ## [Unreleased] (Preview)
 
 ### Added
-- .
+- (**Sync**) Added [SyncYomi](https://github.com/syncyomi/syncyomi) support
+- (**OPDS**) Add option to skip chapter metadata feed providing direct stream/download links
 
 ### Changed
 - (**Database/H2**) Use the latest H2 database engine
@@ -29,6 +30,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**API**) Fix GraphQL `Filter` `notAll` and `notAny` being inversed
 - (**API**) Fix GraphQL `Filter` causing an UnsupportedOperationException when passing an empty list as a `Any` filter value
 - (**Build**) Fix CURL failing silently in builds
+- (**Backup/Database**) Fix backup creation slowdown when mapping chapters
 
 ## [v2.2.2100] + [WebUI: v20260508.01] - 2026-05-08
 

README.md

@@ -110,18 +110,13 @@ Download the latest `linux-x64`(x86_64) release from [the releases section](http
 WebView support is implemented via [JCEF](https://github.com/JetBrains/jcef).
 This is optional, and is only necessary to support some extensions.
 
-To have a functional WebView, several dependencies are required; aside from X11 libraries necessary for rendering Chromium, some JNI bindings are necessary: gluegen and jogl (found in Ubuntu as `libgluegen2-jni` and `libjogl2-jni`).
-Note that on some systems (e.g. Ubuntu), the JNI libraries are not automatically found, see below.
+To have a functional WebView, some X11 dependencies are required for rendering Chromium.
+These include `libxrender`, `libxcomposite` `libxdamage`, `libxkbcommon` and `libxtst`.
 
 A CEF server is launched on startup, which loads the X11 libraries.
 If those are missing, you should see "Could not load 'jcef' library".
 If so, use `ldd ~/.local/share/Tachidesk/bin/kcef/libjcef.so | grep not` to figure out which libraries are not found on your system.
 
-The JNI bindings are only loaded when a browser is actually launched.
-This is done by extensions that rely on WebView, not by Suwayomi itself.
-If there is a problem loading the JNI libraries, you should see a message indicating the library and the search path.
-This search path includes the current working directory, if you do not want to modify system directories.
-
 Refer to the [Dockerfile](https://github.com/Suwayomi/Suwayomi-Server-docker/blob/main/Dockerfile) for more details.
 
 Note that it is required to have an X session active and available to Suwayomi (i.e. `DISPLAY` is set).

buildSrc/src/main/kotlin/Constants.kt

@@ -14,7 +14,7 @@ val getTachideskVersion = { "v2.2.${getCommitCount()}" }
 
 val webUIRevisionTag = "r3136"
 
-val webviewJbrRelease = "jbr-release-25.0.3b475.60"
+val webviewJbrRelease = "jbr-release-25.0.3b508.4"
 
 private val getCommitCount = {
     runCatching {

docs/Configuring-Suwayomi‐Server.md

@@ -232,6 +232,7 @@ server.opdsShowOnlyUnreadChapters = false
 server.opdsShowOnlyDownloadedChapters = false
 server.opdsChapterSortOrder = "DESC"
 server.opdsCbzMimetype = "MODERN"
+server.opdsSkipChapterMetadataFeed = false
 ```
 - `server.opdsUseBinaryFileSizes = false` controls if Suwayomi should display file sizes in binary units (KiB, MiB, GiB) or decimal (KB, MB, GB) in OPDS listings.
 - `server.opdsItemsPerPage = 50` sets the number of items per page in OPDS listings. Range: 10 <= n <= 5000.
@@ -241,6 +242,7 @@ server.opdsCbzMimetype = "MODERN"
 - `server.opdsShowOnlyDownloadedChapters = false` controls if OPDS listings should only include downloaded chapters.
 - `server.opdsChapterSortOrder = "DESC"` sets the default chapter sort order in OPDS listings, either `"ASC"` or `"DESC"`
 - `server.opdsCbzMimetype = "MODERN"` controls which mimetype to use for CBZ downloads. This affects the offered link in OPDS, as well as the content type of the CBZ download. Allowed is MODERN (current IANA standard), LEGACY (deprecated mimetype for .cbz) and COMPATIBLE (deprecated mimetype for all comic archives). Use LEGACY or COMPATIBLE if older clients don't offer the chapter download (note that the chapter needs to first be downloaded in Suwayomi, before it is available in OPDS).
+- `server.opdsSkipChapterMetadataFeed = false` controls if the metadata feed should be skipped. When enabled, download and streaming links are provided directly in the chapter list. This improves compatibility with automated downloaders (like KOReader). KoSync strategies are applied, but `PROMPT` conflicts are ignored (treating local progress as priority).
 
 ### KOReader Sync
 ```
@@ -276,6 +278,28 @@ server.useHikariConnectionPool = true
 - `server.databasePassword` the username with which to authenticate at the PostgreSQL instance.
 - `server.useHikariConnectionPool` use Hikari Connection Pool to connect to the database.
 
+### SyncYomi
+```
+server.syncYomiEnabled = false
+server.syncYomiHost = ""
+server.syncYomiApiKey = ""
+server.syncDataManga = true
+server.syncDataChapters = true
+server.syncDataTracking = true
+server.syncDataHistory = true
+server.syncDataCategories = true
+server.syncInterval = "0s"
+```
+- `server.syncYomiEnabled` controls whether SyncYomi is enabled.
+- `server.syncYomiHost` base URL of the SyncYomi server instance. e.g. `http://localhost:8282`
+- `server.syncYomiApiKey` API key to authenticate with SyncYomi. You must use the same API key in both Suwayomi and SyncYomi.
+- `server.syncDataManga` enables syncing manga.
+- `server.syncDataChapters` enables syncing chapters.
+- `server.syncDataTracking` enables syncing tracking data.
+- `server.syncDataHistory` enables syncing reading history.
+- `server.syncDataCategories` enables syncing categories.
+- `server.syncInterval` interval between automatic sync operations. Use `0s` to disable.
+
 **Note:** The example [docker-compose.yml file](https://github.com/Suwayomi/Suwayomi-Server-docker/blob/main/docker-compose.yml) contains everything you need to get started with Suwayomi+PostgreSQL. Please be aware that PostgreSQL support is currently still in beta.
 
 **Note:** These settings are excluded from backups, so a backup can be used to easily switch database installations by setting up the connection first, then restoring the backup.

gradle/libs.versions.toml

@@ -1,23 +1,23 @@
 [versions]
-kotlin = "2.3.21"
+kotlin = "2.4.0"
 coroutines = "1.11.0"
 serialization = "1.11.0"
 jvmTarget = "21"
-okhttp = "5.3.2" # Major version is locked by Tachiyomi extensions
+okhttp = "5.4.0" # Major version is locked by Tachiyomi extensions
 javalin = "7.2.2"
 jte = "3.2.4"
-jackson = "3.1.3" # jackson version locked by javalin, ref: `io.javalin.core.util.OptionalDependency`
+jackson = "3.2.0" # jackson version locked by javalin, ref: `io.javalin.core.util.OptionalDependency`
 exposed = "1.2.0"
-dex2jar = "2.4.36"
+dex2jar = "2.4.37"
 polyglot = "25.0.3"
 settings = "1.3.0"
 twelvemonkeys = "3.13.1"
-graphqlkotlin = "10.0.0-alpha.4"
+graphqlkotlin = "10.0.0"
 xmlserialization = "0.91.3"
 ktlint = "1.8.0"
-koin = "4.2.1"
+koin = "4.2.2"
 moko = "0.26.4"
-jcef = "144.0.15-g72717cf-chromium-144.0.7559.172-api-1.21-262-b34"
+jcef = "144.0.15-g72717cf-chromium-144.0.7559.172-api-1.21-262-b37"
 
 [libraries]
 # Kotlin
@@ -39,7 +39,7 @@ serialization-xml = { module = "io.github.pdvrieze.xmlutil:serialization-jvm", v
 
 # Logging
 slf4japi = "org.slf4j:slf4j-api:2.0.18"
-logback = "ch.qos.logback:logback-classic:1.5.32"
+logback = "ch.qos.logback:logback-classic:1.5.34"
 kotlinlogging = "io.github.oshai:kotlin-logging-jvm:8.0.4"
 
 # OkHttp
@@ -55,7 +55,7 @@ javalin-openapi = { module = "io.javalin:javalin-openapi", version.ref = "javali
 javalin-rendering = { module = "io.javalin:javalin-rendering-jte", version.ref = "javalin" }
 jackson-databind = { module = "tools.jackson.core:jackson-databind", version.ref = "jackson" }
 jackson-kotlin = { module = "tools.jackson.module:jackson-module-kotlin", version.ref = "jackson" }
-jackson-annotations = "com.fasterxml.jackson.core:jackson-annotations:2.21"
+jackson-annotations = "com.fasterxml.jackson.core:jackson-annotations:2.22"
 jte = { module = "gg.jte:jte", version.ref = "jte" }
 kte = { module = "gg.jte:jte-kotlin", version.ref = "jte" }
 
@@ -72,7 +72,7 @@ exposed-javatime = { module = "org.jetbrains.exposed:exposed-java-time", version
 exposed-kotlintime = { module = "org.jetbrains.exposed:exposed-kotlin-datetime", version.ref = "exposed" }
 postgres = "org.postgresql:postgresql:42.7.11"
 h2 = "com.h2database:h2:2.4.240"
-hikaricp = "com.zaxxer:HikariCP:7.0.2"
+hikaricp = "com.zaxxer:HikariCP:7.1.0"
 
 # Exposed Migrations
 exposed-migrations = "com.github.Suwayomi:exposed-migrations:3.10.1"
@@ -91,7 +91,7 @@ rxjava = "io.reactivex:rxjava:1.3.8"
 jsoup = "org.jsoup:jsoup:1.22.2"
 
 # Config
-config = "com.typesafe:config:1.4.8"
+config = "com.typesafe:config:1.4.9"
 config4k = "io.github.config4k:config4k:0.7.0"
 
 # Sort
@@ -145,7 +145,7 @@ twelvemonkeys-imageio-metadata = { module = "com.twelvemonkeys.imageio:imageio-m
 twelvemonkeys-imageio-jpeg = { module = "com.twelvemonkeys.imageio:imageio-jpeg", version.ref = "twelvemonkeys" }
 twelvemonkeys-imageio-webp = { module = "com.twelvemonkeys.imageio:imageio-webp", version.ref = "twelvemonkeys" }
 
-imageio-webp = "com.github.usefulness:webp-imageio:0.10.2"
+imageio-webp = "com.github.usefulness:webp-imageio:0.11.0"
 
 # Testing
 mockk = "io.mockk:mockk:1.14.11"
@@ -158,8 +158,6 @@ cronUtils = "com.cronutils:cron-utils:9.2.1"
 
 # Webview
 jcef = { module = "org.jetbrains.intellij.deps.jcef:jcef", version.ref = "jcef" }
-gluegen = "org.jogamp.gluegen:gluegen-rt:2.5.0"
-jogl = "org.jogamp.jogl:jogl-all:2.5.0"
 
 # User
 jwt = "com.auth0:java-jwt:4.5.2"
@@ -180,13 +178,13 @@ kotlin-multiplatform = { id = "org.jetbrains.kotlin.multiplatform", version.ref
 ktlint = { id = "org.jlleitschuh.gradle.ktlint", version = "14.2.0"}
 
 # Build config
-buildconfig = { id = "com.github.gmazzo.buildconfig", version = "6.0.9"}
+buildconfig = { id = "com.github.gmazzo.buildconfig", version = "6.0.10"}
 
 # Download
 download = { id = "de.undercouch.download", version = "5.7.0"}
 
 # ShadowJar
-shadowjar = { id = "com.gradleup.shadow", version = "8.3.11"}
+shadowjar = { id = "com.gradleup.shadow", version = "9.4.3"}
 
 # Moko
 moko = { id = "dev.icerock.mobile.multiplatform-resources", version.ref = "moko" }

renovate.json

@@ -16,14 +16,43 @@
       "depNameTemplate": "zulu",
       "datasourceTemplate": "custom.zulu",
       "versioningTemplate": "regex:^(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+).*$"
+    },
+    {
+      "customType": "regex",
+      "managerFilePatterns": [
+        "/buildSrc/src/main/kotlin/Constants.kt/"
+      ],
+      "matchStrings": [
+        "val\\s+webviewJbrRelease\\s*=\\s*\"(?<currentValue>[^\"]+)\""
+      ],
+      "depNameTemplate": "JetBrainsRuntime",
+      "packageNameTemplate": "JetBrains/JetBrainsRuntime",
+      "datasourceTemplate": "github-releases",
+      "versioningTemplate": "regex:^jbr-release-(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)b(?<build>\\d+)\\.(?<revision>\\d+)$"
     }
   ],
   "customDatasources": {
     "zulu": {
       "defaultRegistryUrlTemplate": "https://api.azul.com/metadata/v1/zulu/packages?availability_types=ca&release_status=both&java_package_type=jre&crac_supported=false&javafx_bundled=false&support_term=lts&arch=x86&os=linux&archive_type=zip&page_size=1000&include_fields=java_package_features,release_status,support_term,os,arch,hw_bitness,abi,java_package_type,javafx_bundled,sha256_hash,cpu_gen,size,archive_type,certifications,lib_c_type,crac_supported&page=1&azul_com=true",
       "transformTemplates": [
-        "{\"releases\": $$.$join([$join($map(distro_version[[0..2]], $string), \".\"), \"_\", $join($map(java_version, $string), \".\")])}"
+        "{ \"releases\": $map($, function($v) { { \"version\": $join([$string($v.distro_version[0]), \".\", $string($v.distro_version[1]), \".\", $string($v.distro_version[2]), \"_\", $string($v.java_version[0]), \".\", $string($v.java_version[1]), \".\", $string($v.java_version[2])]) } }) }"
       ]
     }
-  }
+  },
+  "packageRules": [
+    {
+      "matchPackageNames": [
+        "org.jetbrains.intellij.deps.jcef:jcef",
+        "JetBrains/JetBrainsRuntime"
+      ],
+      "groupName": "JCEF + JetBrains Runtime",
+      "groupSlug": "jcef-jbr"
+    },
+    {
+      "matchPackageNames": [
+        "com.github.Suwayomi:android-jar"
+      ],
+      "enabled": false
+    }
+  ]
 }

scripts/bundler.sh

@@ -42,7 +42,7 @@ main() {
     gcc -fPIC -shared scripts/resources/catch_abort.c -lpthread -o scripts/resources/catch_abort.so
   fi
 
-  JRE_ZULU="25.30.17_25.0.1"
+  JRE_ZULU="25.34.17_25.0.3"
   JRE_RELEASE="jre${JRE_ZULU#*_}" # e.g. jre25.0.1
   ZULU_RELEASE="zulu${JRE_ZULU%_*}" # e.g. zulu25.30.17
 

server/build.gradle.kts

@@ -37,10 +37,6 @@ dependencies {
     implementation(libs.bundles.shared)
     testImplementation(libs.bundles.sharedTest)
 
-    // WebView
-    implementation(libs.gluegen)
-    implementation(libs.jogl)
-
     // OkHttp
     implementation(libs.bundles.okhttp)
     implementation(libs.okio)

server/i18n/src/commonMain/moko-resources/values/base/strings.xml

@@ -50,6 +50,7 @@
     <!-- OPDS errors -->
     <string name="opds_error_manga_not_found">Series with ID %1$d not found.</string>
     <string name="opds_error_chapter_not_found">Chapter with index %1$d not found.</string>
+    <string name="opds_error_chapters_not_found">No chapters found or the source is unreachable on page %1$d.</string>
 
     <!-- OPDS facets (Filters and Sorting) -->
     <string name="opds_facetgroup_sort_order">Sort Order</string>
@@ -153,4 +154,7 @@
     <string name="login_label_login">Log In</string>
     <string name="login_placeholder_username">Type username...</string>
     <string name="login_placeholder_password">Secret...</string>
+
+    <string name="opds_chapter_title_oneshot">Oneshot</string>
+    <string name="opds_chapter_title_fallback">Chapter %1$s</string>
 </resources>

server/i18n/src/commonMain/moko-resources/values/el/strings.xml

@@ -0,0 +1,125 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <string name="opds_feeds_root">Suwayomi OPDS Κατάλογος</string>
+    <string name="opds_feeds_manga_chapters">Κεφάλαια %1$s</string>
+    <string name="opds_feeds_chapter_details">%1$s | %2$s | Λεπτομέρειες</string>
+    <string name="opds_feeds_explore_title">Εξερεύνηση</string>
+    <string name="opds_feeds_explore_entry_content">Εξερεύνησε νέες σειρές από τις πηγές σου</string>
+    <string name="opds_feeds_history_title">Ιστορικό</string>
+    <string name="opds_feeds_history_entry_content">Πρόσφατα διαβασμένα κεφάλαια</string>
+    <string name="opds_feeds_all_series_in_library_title">Όλες οι σειρές</string>
+    <string name="opds_feeds_all_series_in_library_entry_content">Περιήγηση σε όλες τις σειρές της βιβλιοθήκης σου</string>
+    <string name="opds_feeds_library_sources_title">Πηγές</string>
+    <string name="opds_feeds_library_sources_entry_content">Περιήγηση σε σειρές της βιβλιοθήκης σου φιλτραρισμένες κατά πηγή</string>
+    <string name="opds_feeds_categories_title">Κατηγορίες</string>
+    <string name="opds_feeds_categories_entry_content">Περιήγηση σε σειρές οργανωμένες κατά κατηγορία</string>
+    <string name="opds_feeds_genres_title">Είδη</string>
+    <string name="opds_feeds_genres_entry_content">Περιήγηση σε σειρές κατά ετικέτες είδους</string>
+    <string name="opds_feeds_status_title">Κατάσταση</string>
+    <string name="opds_feeds_status_entry_content">Περιήγηση σε σειρές κατά κατάσταση δημοσίευσης</string>
+    <string name="opds_feeds_languages_title">Γλώσσες</string>
+    <string name="opds_feeds_languages_entry_content">Περιήγηση σε σειρές κατά γλώσσα περιεχομένου</string>
+    <string name="opds_feeds_library_updates_title">Ιστορικό ενημερώσεων βιβλιοθήκης</string>
+    <string name="opds_feeds_library_updates_entry_content">Πρόσφατα ενημερωμένα κεφάλαια από τη βιβλιοθήκη σου</string>
+    <string name="opds_feeds_search_results_title">Αποτελέσματα αναζήτησης</string>
+    <string name="opds_feeds_sources_title">Όλες οι πηγές</string>
+    <string name="opds_feeds_category_specific_title">Κατηγορία: %1$s</string>
+    <string name="opds_feeds_genre_specific_title">Είδος: %1$s</string>
+    <string name="opds_feeds_status_specific_title">Κατάσταση: %1$s</string>
+    <string name="opds_feeds_language_specific_title">Γλώσσα: %1$s</string>
+    <string name="opds_feeds_source_specific_title">Πηγή: %1$s</string>
+    <string name="opds_feeds_library_source_specific_title">Βιβλιοθήκη - Πηγή: %1$s</string>
+    <string name="opds_feeds_source_specific_popular_title">Πηγή: %1$s - Δημοφιλές</string>
+    <string name="opds_feeds_source_specific_latest_title">Πηγή: %1$s - Τελευταίο</string>
+    <string name="opds_search_shortname">Suwayomi OPDS Αναζήτηση</string>
+    <string name="opds_search_description">Αναζήτηση σειρών στον κατάλογο.</string>
+    <string name="opds_error_manga_not_found">Η σειρά με ID %1$d δεν βρέθηκε.</string>
+    <string name="opds_error_chapter_not_found">Το κεφάλαιο με δείκτη %1$d δεν βρέθηκε.</string>
+    <string name="opds_facetgroup_sort_order">Σειρά ταξινόμησης</string>
+    <string name="opds_facetgroup_filter_read_status">Φίλτρο κατά κατάσταση ανάγνωσης</string>
+    <string name="opds_facetgroup_filter_content">Φίλτρο περιεχομένου</string>
+    <string name="opds_facetgroup_filter_source">Φίλτρο κατά πηγή</string>
+    <string name="opds_facetgroup_filter_category">Φίλτρο κατά κατηγορία</string>
+    <string name="opds_facetgroup_filter_status">Φίλτρο κατά κατάσταση</string>
+    <string name="opds_facetgroup_filter_language">Φίλτρο κατά γλώσσα</string>
+    <string name="opds_facetgroup_filter_genre">Φίλτρο κατά είδος</string>
+    <string name="opds_facet_sort_oldest_first">Παλαιότερα πρώτα</string>
+    <string name="opds_facet_sort_newest_first">Νεότερα πρώτα</string>
+    <string name="opds_facet_sort_date_asc">Ημερομηνία αύξουσα</string>
+    <string name="opds_facet_sort_date_desc">Ημερομηνία φθίνουσα</string>
+    <string name="opds_facet_sort_popular">Δημοφιλές</string>
+    <string name="opds_facet_sort_latest">Τελευταίο</string>
+    <string name="opds_facet_sort_alpha_asc">Αλφαβητικά Α-Ω</string>
+    <string name="opds_facet_sort_alpha_desc">Αλφαβητικά Ω-Α</string>
+    <string name="opds_facet_sort_last_read_desc">Τελευταία ανάγνωση</string>
+    <string name="opds_facet_sort_latest_chapter_desc">Τελευταίο κεφάλαιο</string>
+    <string name="opds_facet_sort_date_added_desc">Ημερομηνία προσθήκης</string>
+    <string name="opds_facet_sort_unread_desc">Αδιάβαστα κεφάλαια</string>
+    <string name="opds_facet_filter_all">Όλα</string>
+    <string name="opds_facet_filter_all_chapters">Όλα τα κεφάλαια</string>
+    <string name="opds_facet_filter_unread_only">Αδιάβαστα</string>
+    <string name="opds_facet_filter_read_only">Διαβασμένα</string>
+    <string name="opds_facet_filter_downloaded">Ληφθέντα</string>
+    <string name="opds_facet_filter_ongoing">Σε εξέλιξη</string>
+    <string name="opds_facet_filter_completed">Ολοκληρωμένα</string>
+    <string name="opds_facet_all_sources">Όλες οι πηγές</string>
+    <string name="opds_facet_all_categories">Όλες οι κατηγορίες</string>
+    <string name="opds_facet_all_statuses">Όλες οι καταστάσεις</string>
+    <string name="opds_facet_all_languages">Όλες οι γλώσσες</string>
+    <string name="opds_facet_all_genres">Όλα τα είδη</string>
+    <string name="opds_linktitle_catalog_root">Ρίζα καταλόγου</string>
+    <string name="opds_linktitle_search_catalog">Αναζήτηση καταλόγου</string>
+    <string name="opds_linktitle_first_page">Πρώτη σελίδα</string>
+    <string name="opds_linktitle_previous_page">Προηγούμενη σελίδα</string>
+    <string name="opds_linktitle_next_page">Επόμενη σελίδα</string>
+    <string name="opds_linktitle_last_page">Τελευταία σελίδα</string>
+    <string name="opds_linktitle_self_feed">Τρέχουσα ροή</string>
+    <string name="opds_linktitle_view_on_web">Προβολή στο Web</string>
+    <string name="opds_linktitle_stream_pages_start">Διάβασε Online</string>
+    <string name="opds_linktitle_stream_pages_continue">Συνέχισε να διαβάζεις Online</string>
+    <string name="opds_linktitle_stream_pages_start_local">Διάβασε Online (Τοπική πρόοδος)</string>
+    <string name="opds_linktitle_stream_pages_continue_local">Συνέχισε να διαβάζεις Online (Τοπική πρόοδος)</string>
+    <string name="opds_linktitle_stream_pages_start_remote">Διάβασε Online (Συγχρονισμένο από %1$s)</string>
+    <string name="opds_linktitle_stream_pages_continue_remote">Συνέχισε να διαβάζεις Online (Συγχρονισμένο από %1$s)</string>
+    <string name="opds_linktitle_download_cbz">Λήψη CBZ</string>
+    <string name="opds_linktitle_chapter_cover">Εξώφυλλο κεφαλαίου</string>
+    <string name="opds_linktitle_view_chapter_details">Λεπτομέρειες κεφαλαίου &amp; Σελίδες</string>
+    <string name="opds_chapter_status_read">✅</string>
+    <string name="opds_chapter_status_in_progress">⌛</string>
+    <string name="opds_chapter_status_unread">⭕</string>
+    <string name="opds_chapter_status_downloaded">⬇️</string>
+    <string name="opds_chapter_status_synced">🌐</string>
+    <string name="opds_chapter_details_base">Σειρά: %1$s | %2$s</string>
+    <string name="opds_chapter_details_scanlator">| Από %1$s</string>
+    <string name="opds_chapter_details_progress">| Πρόοδος: %1$d από %2$d</string>
+    <string name="opds_manga_summary_status">Κατάσταση: %1$s</string>
+    <string name="opds_manga_summary_source">Πηγή: %1$s</string>
+    <string name="opds_manga_summary_language">Γλώσσα: %1$s</string>
+    <string name="manga_status_ongoing">Σε εξέλιξη</string>
+    <string name="manga_status_completed">Ολοκληρωμένο</string>
+    <string name="manga_status_licensed">Υπό άδεια</string>
+    <string name="manga_status_publishing_finished">Δημοσίευση ολοκληρωμένη</string>
+    <string name="manga_status_cancelled">Ακυρωμένο</string>
+    <string name="manga_status_on_hiatus">Σε παύση</string>
+    <string name="manga_status_unknown">Άγνωστο</string>
+    <string name="label_error">Σφάλμα</string>
+    <string name="label_version">Έκδοση <xliff:g id="version" example="v2.0.1833">%1$s</xliff:g></string>
+    <string name="label_close">Κλείσε</string>
+    <string name="webview_label_title">Suwayomi WebView</string>
+    <string name="webview_label_disconnected">Αποσυνδεδεμένο, κάνε ανανέωση</string>
+    <string name="webview_label_reversescroll">Αντίστροφη κύλιση</string>
+    <string name="webview_label_bindingshint">Σημείωση: Όταν η εστίαση είναι στο τμήμα WebView, καμία συντόμευση πληκτρολογίου, συμπεριλαμβανομένης της ανανέωσης, δεν θα αντιμετωπίζεται από το πρόγραμμα περιήγησης.</string>
+    <string name="webview_label_init">Αρχικοποίηση... Παρακαλώ περίμενε</string>
+    <string name="webview_label_getstarted">Εισήγαγε μια διεύθυνση URL για να ξεκινήσεις</string>
+    <string name="webview_label_loading">Φόρτωση σελίδας...</string>
+    <string name="webview_label_copy">Αντιγραφή στο πρόχειρο</string>
+    <string name="webview_label_copy_description">Η αυτόματη αντιγραφή στο πρόχειρο απέτυχε, χρησιμοποίησε το παρακάτω πεδίο για να αντιγράψεις χειροκίνητα την τιμή.</string>
+    <string name="webview_label_login_required">Η διαμόρφωσή σου απαιτεί σύνδεση. Εισήγαγε όνομα χρήστη και κωδικό.</string>
+    <string name="webview_placeholder_url">Εισήγαγε URL...</string>
+    <string name="login_label_title">Suwayomi Σύνδεση</string>
+    <string name="login_label_username">Όνομα χρήστη</string>
+    <string name="login_label_password">Κωδικός</string>
+    <string name="login_label_login">Σύνδεση</string>
+    <string name="login_placeholder_username">Πληκτρολόγησε όνομα χρήστη...</string>
+    <string name="login_placeholder_password">Μυστικό...</string>
+</resources>

server/server-config/src/main/kotlin/suwayomi/tachidesk/server/ServerConfig.kt

@@ -15,16 +15,13 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.channels.BufferOverflow
 import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.MutableSharedFlow
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.conflate
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.drop
 import kotlinx.coroutines.flow.launchIn
-import kotlinx.coroutines.flow.mapLatest
 import kotlinx.coroutines.flow.onEach
 import org.jetbrains.exposed.v1.core.SortOrder
 import suwayomi.tachidesk.graphql.types.AuthMode
@@ -1038,7 +1035,77 @@ class ServerConfig(
         description = "Enable the WebView via CEF (Chromium)"
     )
 
+    val syncYomiEnabled: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 87,
+        defaultValue = false,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true
+    )
 
+    val syncYomiHost: MutableStateFlow<String> by StringSetting(
+        protoNumber = 88,
+        defaultValue = "",
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val syncYomiApiKey: MutableStateFlow<String> by StringSetting(
+        protoNumber = 89,
+        defaultValue = "",
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = false,
+    )
+
+    val syncDataManga: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 90,
+        defaultValue = true,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val syncDataChapters: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 91,
+        defaultValue = true,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val syncDataTracking: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 92,
+        defaultValue = true,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val syncDataHistory: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 93,
+        defaultValue = true,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val syncDataCategories: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 94,
+        defaultValue = true,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val syncInterval: MutableStateFlow<Duration> by DurationSetting(
+        protoNumber = 95,
+        defaultValue = 0.seconds,
+        group = SettingGroup.SYNCYOMI,
+        privacySafe = true,
+    )
+
+    val opdsSkipChapterMetadataFeed: MutableStateFlow<Boolean> by BooleanSetting(
+        protoNumber = 96,
+        group = SettingGroup.OPDS,
+        privacySafe = true,
+        defaultValue = false,
+        description = "Skips the metadata feed and provides download/stream links directly in the chapter list. Improves compatibility with KOReader auto-downloader. KoSync strategies are applied, but PROMPT conflicts are ignored (treating local progress as priority)."
+
+    )
 
     /** ****************************************************************** **/
     /**                                                                    **/

server/server-config/src/main/kotlin/suwayomi/tachidesk/server/settings/SettingGroup.kt

@@ -18,6 +18,7 @@ enum class SettingGroup(
     OPDS("OPDS"),
     KOREADER_SYNC("KOReader sync"),
     WEB_VIEW("WebView"),
+    SYNCYOMI("SyncYomi")
     ;
 
     override fun toString(): String = value

server/src/main/kotlin/suwayomi/tachidesk/global/impl/sync/SyncManager.kt

@@ -0,0 +1,519 @@
+package suwayomi.tachidesk.global.impl.sync
+
+import android.app.Application
+import android.content.Context
+import io.github.oshai.kotlinlogging.KotlinLogging
+import kotlinx.coroutines.DelicateCoroutinesApi
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.first
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.sync.Mutex
+import kotlinx.coroutines.sync.withLock
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.protobuf.ProtoBuf
+import org.jetbrains.exposed.v1.core.and
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.jdbc.selectAll
+import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import org.jetbrains.exposed.v1.jdbc.update
+import suwayomi.tachidesk.graphql.types.StartSyncResult
+import suwayomi.tachidesk.manga.impl.Category
+import suwayomi.tachidesk.manga.impl.Library.handleMangaThumbnail
+import suwayomi.tachidesk.manga.impl.backup.BackupFlags
+import suwayomi.tachidesk.manga.impl.backup.proto.ProtoBackupImport
+import suwayomi.tachidesk.manga.impl.backup.proto.handlers.BackupCategoryHandler
+import suwayomi.tachidesk.manga.impl.backup.proto.handlers.BackupMangaHandler
+import suwayomi.tachidesk.manga.impl.backup.proto.handlers.BackupSourceHandler
+import suwayomi.tachidesk.manga.impl.backup.proto.models.Backup
+import suwayomi.tachidesk.manga.impl.backup.proto.models.BackupChapter
+import suwayomi.tachidesk.manga.impl.backup.proto.models.BackupManga
+import suwayomi.tachidesk.manga.model.dataclass.ChapterDataClass
+import suwayomi.tachidesk.manga.model.dataclass.MangaDataClass
+import suwayomi.tachidesk.manga.model.table.CategoryMangaTable
+import suwayomi.tachidesk.manga.model.table.CategoryTable
+import suwayomi.tachidesk.manga.model.table.ChapterTable
+import suwayomi.tachidesk.manga.model.table.MangaTable
+import suwayomi.tachidesk.manga.model.table.toDataClass
+import suwayomi.tachidesk.server.serverConfig
+import suwayomi.tachidesk.util.HAScheduler
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+import kotlin.time.Clock
+import kotlin.time.Duration.Companion.seconds
+import kotlin.time.Instant
+import kotlin.time.measureTime
+
+@Serializable
+data class SyncData(
+    val backup: Backup? = null,
+)
+
+object SyncManager {
+    private val syncPreferences = Injekt.get<Application>().getSharedPreferences("sync", Context.MODE_PRIVATE)
+    private val logger = KotlinLogging.logger {}
+
+    private var currentTaskId: String? = null
+    private val syncMutex = Mutex()
+
+    private val _lastSyncState: MutableStateFlow<SyncState?> = MutableStateFlow(null)
+    val lastSyncState: StateFlow<SyncState?> = _lastSyncState.asStateFlow()
+
+    @OptIn(DelicateCoroutinesApi::class)
+    fun scheduleSyncTask() {
+        serverConfig.subscribeTo(
+            combine(
+                serverConfig.syncYomiEnabled,
+                serverConfig.syncInterval,
+            ) { enabled, interval -> Pair(enabled, interval) },
+            { (enabled, interval) ->
+                currentTaskId?.let { HAScheduler.deschedule(it) }
+
+                currentTaskId =
+                    if (enabled && interval > 0.seconds) {
+                        val lastSyncDate =
+                            syncPreferences
+                                .getLong("last_scheduled_sync", 0L)
+                                .takeIf { it != 0L }
+                                ?.let { Instant.fromEpochMilliseconds(it) }
+
+                        if (lastSyncDate == null) {
+                            syncPreferences
+                                .edit()
+                                .putLong("last_scheduled_sync", Clock.System.now().toEpochMilliseconds())
+                                .apply()
+                        }
+
+                        val delay =
+                            if (lastSyncDate != null) {
+                                ((interval) - (Clock.System.now() - lastSyncDate)).coerceAtLeast(0.seconds)
+                            } else {
+                                interval
+                            }
+
+                        HAScheduler.schedule(
+                            {
+                                startSync(periodic = true)
+
+                                syncPreferences
+                                    .edit()
+                                    .putLong("last_scheduled_sync", Clock.System.now().toEpochMilliseconds())
+                                    .apply()
+                            },
+                            interval = interval.inWholeMilliseconds,
+                            delay = delay.inWholeMilliseconds,
+                            name = "sync",
+                        )
+                    } else {
+                        syncPreferences
+                            .edit()
+                            .remove("last_scheduled_sync")
+                            .apply()
+                        null
+                    }
+            },
+            ignoreInitialValue = false,
+        )
+    }
+
+    @OptIn(DelicateCoroutinesApi::class)
+    fun startSync(periodic: Boolean = false): StartSyncResult {
+        if (!serverConfig.syncYomiEnabled.value) {
+            return StartSyncResult.SYNC_DISABLED
+        }
+
+        if (!syncMutex.tryLock()) {
+            return StartSyncResult.SYNC_IN_PROGRESS
+        }
+
+        GlobalScope.launch {
+            try {
+                syncData(periodic)
+            } finally {
+                syncMutex.unlock()
+            }
+        }
+
+        return StartSyncResult.SUCCESS
+    }
+
+    suspend fun ensureSync() {
+        if (!serverConfig.syncYomiEnabled.value) {
+            return
+        }
+
+        if (syncMutex.tryLock()) {
+            // there is no ongoing sync, so start one
+            try {
+                syncData()
+            } finally {
+                syncMutex.unlock()
+            }
+        } else {
+            // wait for the ongoing sync to finish
+            syncMutex.withLock {}
+        }
+    }
+
+    private suspend fun syncData(periodic: Boolean = false) {
+        val startInstant = Clock.System.now()
+        _lastSyncState.value = SyncState.Started(startInstant)
+
+        try {
+            logger.info {
+                if (periodic) {
+                    "Starting periodic sync"
+                } else {
+                    "Starting manual sync"
+                }
+            }
+
+            transaction {
+                MangaTable.update({ MangaTable.isSyncing eq true }) {
+                    it[isSyncing] = false
+                }
+                ChapterTable.update({ ChapterTable.isSyncing eq true }) {
+                    it[isSyncing] = false
+                }
+                CategoryTable.update({ CategoryTable.isSyncing eq true }) {
+                    it[isSyncing] = false
+                }
+            }
+
+            val backupFlags =
+                BackupFlags(
+                    includeManga = serverConfig.syncDataManga.value,
+                    includeCategories = serverConfig.syncDataCategories.value,
+                    includeChapters = serverConfig.syncDataChapters.value,
+                    includeTracking = serverConfig.syncDataTracking.value,
+                    includeHistory = serverConfig.syncDataHistory.value,
+                    includeClientData = false,
+                    includeServerSettings = false,
+                )
+
+            _lastSyncState.value = SyncState.CreatingBackup(startInstant)
+            val backupMangas = BackupMangaHandler.backup(backupFlags)
+            val backup =
+                Backup(
+                    backupMangas,
+                    BackupCategoryHandler.backup(backupFlags).filter { it.name != Category.DEFAULT_CATEGORY_NAME },
+                    BackupSourceHandler.backup(backupMangas, backupFlags),
+                    emptyMap(),
+                    null,
+                )
+
+            val syncData =
+                SyncData(
+                    backup = backup,
+                )
+
+            val remoteBackup =
+                SyncYomiSyncService.doSync(syncData, startInstant) {
+                    _lastSyncState.value = it
+                }
+
+            if (remoteBackup == null) {
+                logger.debug { "Skip restore due to network issues" }
+                finishWithError(startInstant, "Network error", periodic)
+                return
+            }
+
+            if (remoteBackup === syncData.backup) {
+                // nothing changed
+                logger.debug { "Skip restore due to remote was overwrite from local" }
+                finishWithSuccess(startInstant, periodic)
+                return
+            }
+
+            // Stop the sync early if the remote backup is null or empty
+            if (remoteBackup.backupManga.isEmpty() && remoteBackup.backupCategories.isEmpty() && remoteBackup.backupSources.isEmpty()) {
+                logger.error { "No data found on remote server." }
+                finishWithError(startInstant, "No data found on remote server.", periodic)
+                return
+            }
+
+            val isLibraryEmpty =
+                transaction {
+                    MangaTable
+                        .selectAll()
+                        .where { MangaTable.inLibrary eq true }
+                        .empty()
+                }
+
+            // Check if it's first sync based on lastSyncTimestamp
+            if (syncPreferences.getLong("last_sync_timestamp", 0) == 0L && !isLibraryEmpty) {
+                // It's first sync no need to restore data. (just update remote data)
+                finishWithSuccess(startInstant, periodic)
+                return
+            }
+
+            val (filteredFavorites, nonFavorites) = filterFavoritesAndNonFavorites(remoteBackup)
+            updateNonFavorites(nonFavorites)
+
+            val newSyncData =
+                backup.copy(
+                    backupManga = filteredFavorites,
+                    backupCategories = remoteBackup.backupCategories,
+                    backupSources = remoteBackup.backupSources,
+                )
+
+            val hasMangaChanges = filteredFavorites.isNotEmpty()
+            val hasCategoryChanges = remoteBackup.backupCategories != backup.backupCategories
+            val hasSourceChanges = remoteBackup.backupSources != backup.backupSources
+
+            if (!hasMangaChanges && !hasCategoryChanges && !hasSourceChanges) {
+                // update the sync timestamp
+                finishWithSuccess(startInstant, periodic)
+                return
+            }
+
+            if (serverConfig.syncDataCategories.value) {
+                val mergedUids = newSyncData.backupCategories.map { it.uid }.toSet()
+                val mergedNames = newSyncData.backupCategories.map { it.name }.toSet()
+                val localCategories = Category.getCategoryList().filterNot { it.default } // Exclude system category
+                val categoriesToDelete =
+                    localCategories.filter {
+                        it.uid !in mergedUids && it.name !in mergedNames
+                    }
+                if (categoriesToDelete.isNotEmpty()) {
+                    transaction {
+                        categoriesToDelete.forEach {
+                            Category.removeCategory(it.id)
+                        }
+                    }
+                }
+            }
+
+            val backupStream = ProtoBuf.encodeToByteArray(Backup.serializer(), newSyncData).inputStream()
+            val restoreId =
+                ProtoBackupImport.restore(
+                    sourceStream = backupStream,
+                    flags = backupFlags,
+                    isSync = true,
+                )
+            _lastSyncState.value = SyncState.Restoring(startInstant, restoreId)
+
+            ProtoBackupImport.notifyFlow.first {
+                val restoreState = ProtoBackupImport.getRestoreState(restoreId)
+
+                restoreState == ProtoBackupImport.BackupRestoreState.Success ||
+                    restoreState == ProtoBackupImport.BackupRestoreState.Failure
+            }
+
+            // update the sync timestamp
+            finishWithSuccess(startInstant, periodic)
+        } catch (e: Throwable) {
+            logger.error { "Error syncing: ${e.message}" }
+            finishWithError(startInstant, "${e::class.qualifiedName}: ${e.message}", periodic)
+        }
+    }
+
+    private fun finishWithSuccess(
+        startInstant: Instant,
+        periodic: Boolean,
+    ) {
+        syncPreferences
+            .edit()
+            .putLong("last_sync_timestamp", Clock.System.now().toEpochMilliseconds())
+            .apply()
+        _lastSyncState.value = SyncState.Success(startInstant)
+
+        logger.info {
+            if (periodic) {
+                "Periodic sync completed successfully"
+            } else {
+                "Manual sync completed successfully"
+            }
+        }
+    }
+
+    private fun finishWithError(
+        startInstant: Instant,
+        message: String,
+        periodic: Boolean,
+    ) {
+        _lastSyncState.value = SyncState.Error(startInstant, message)
+
+        logger.info {
+            if (periodic) {
+                "Periodic sync failed: $message"
+            } else {
+                "Manual sync failed: $message"
+            }
+        }
+    }
+
+    private fun isMangaDifferent(
+        localManga: MangaDataClass,
+        remoteManga: BackupManga,
+    ): Boolean {
+        if (localManga.version != remoteManga.version) {
+            return true
+        }
+
+        val localChapters =
+            transaction {
+                ChapterTable
+                    .selectAll()
+                    .where { ChapterTable.manga eq localManga.id }
+                    .map { ChapterTable.toDataClass(it) }
+            }
+
+        if (areChaptersDifferent(localChapters, remoteManga.chapters)) {
+            return true
+        }
+
+        val localCategories =
+            transaction {
+                CategoryMangaTable
+                    .innerJoin(CategoryTable)
+                    .selectAll()
+                    .where { CategoryMangaTable.manga eq localManga.id }
+                    .map { it[CategoryTable.order] }
+            }
+
+        return localCategories.toSet() != remoteManga.categories.toSet()
+    }
+
+    private fun areChaptersDifferent(
+        localChapters: List<ChapterDataClass>,
+        remoteChapters: List<BackupChapter>,
+    ): Boolean {
+        val localChapterMap = localChapters.associateBy { it.url }
+        val remoteChapterMap = remoteChapters.associateBy { it.url }
+
+        if (localChapterMap.size != remoteChapterMap.size) {
+            return true
+        }
+
+        for ((url, localChapter) in localChapterMap) {
+            val remoteChapter = remoteChapterMap[url]
+
+            // If a matching remote chapter doesn't exist, or the version numbers are different, consider them different
+            if (remoteChapter == null || localChapter.version != remoteChapter.version) {
+                return true
+            }
+        }
+
+        return false
+    }
+
+    private fun filterFavoritesAndNonFavorites(backup: Backup): Pair<List<BackupManga>, List<BackupManga>> {
+        val favorites = mutableListOf<BackupManga>()
+        val nonFavorites = mutableListOf<BackupManga>()
+
+        val elapsedTime =
+            measureTime {
+                logger.debug { "Starting to filter favorites and non-favorites from backup data." }
+
+                backup.backupManga.forEach { remoteManga ->
+                    val localManga =
+                        transaction {
+                            MangaTable
+                                .selectAll()
+                                .where {
+                                    (MangaTable.sourceReference eq remoteManga.source) and
+                                        (MangaTable.url eq remoteManga.url)
+                                }.limit(1)
+                                .map { MangaTable.toDataClass(it) }
+                                .firstOrNull()
+                        }
+
+                    when {
+                        // Checks if the manga is in favorites and needs updating or adding
+                        remoteManga.favorite -> {
+                            if (localManga == null || isMangaDifferent(localManga, remoteManga)) {
+                                logger.debug { "Adding to favorites: ${remoteManga.title}" }
+                                favorites.add(remoteManga)
+                            } else {
+                                logger.debug { "Already up-to-date favorite: ${remoteManga.title}" }
+                            }
+                        }
+
+                        // Handle non-favorites
+                        !remoteManga.favorite -> {
+                            logger.debug { "Adding to non-favorites: ${remoteManga.title}" }
+                            nonFavorites.add(remoteManga)
+                        }
+                    }
+                }
+            }
+
+        logger.debug {
+            "Filtering completed in $elapsedTime. Favorites found: ${favorites.size}, Non-favorites found: ${nonFavorites.size}"
+        }
+
+        return Pair(favorites, nonFavorites)
+    }
+
+    private fun updateNonFavorites(nonFavorites: List<BackupManga>) {
+        nonFavorites.forEach { nonFavorite ->
+            val localManga =
+                transaction {
+                    MangaTable
+                        .selectAll()
+                        .where {
+                            (MangaTable.sourceReference eq nonFavorite.source) and
+                                (MangaTable.url eq nonFavorite.url)
+                        }.limit(1)
+                        .map { MangaTable.toDataClass(it) }
+                        .firstOrNull()
+                }
+
+            if (localManga != null) {
+                if (localManga.inLibrary != nonFavorite.favorite) {
+                    transaction {
+                        MangaTable.update({ MangaTable.id eq localManga.id }) {
+                            it[inLibrary] = nonFavorite.favorite
+                        }
+                    }.apply {
+                        handleMangaThumbnail(localManga.id, nonFavorite.favorite)
+                    }
+                }
+            }
+        }
+    }
+
+    sealed class SyncState(
+        open val startDate: Instant,
+    ) {
+        data class Started(
+            override val startDate: Instant,
+        ) : SyncState(startDate)
+
+        data class CreatingBackup(
+            override val startDate: Instant,
+        ) : SyncState(startDate)
+
+        data class Downloading(
+            override val startDate: Instant,
+        ) : SyncState(startDate)
+
+        data class Merging(
+            override val startDate: Instant,
+        ) : SyncState(startDate)
+
+        data class Uploading(
+            override val startDate: Instant,
+        ) : SyncState(startDate)
+
+        data class Restoring(
+            override val startDate: Instant,
+            val restoreId: String,
+        ) : SyncState(startDate)
+
+        data class Success(
+            override val startDate: Instant,
+            val endDate: Instant = Clock.System.now(),
+        ) : SyncState(startDate)
+
+        data class Error(
+            override val startDate: Instant,
+            val message: String,
+            val endDate: Instant = Clock.System.now(),
+        ) : SyncState(startDate)
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/global/impl/sync/SyncYomiSyncService.kt

@@ -0,0 +1,597 @@
+package suwayomi.tachidesk.global.impl.sync
+
+import android.app.Application
+import android.content.Context
+import eu.kanade.tachiyomi.network.GET
+import eu.kanade.tachiyomi.network.NetworkHelper
+import eu.kanade.tachiyomi.network.POST
+import eu.kanade.tachiyomi.network.PUT
+import eu.kanade.tachiyomi.network.await
+import io.github.oshai.kotlinlogging.KotlinLogging
+import io.javalin.http.HttpStatus
+import kotlinx.coroutines.CancellationException
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.SerializationException
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.protobuf.ProtoBuf
+import okhttp3.Headers
+import okhttp3.MediaType.Companion.toMediaType
+import okhttp3.RequestBody.Companion.toRequestBody
+import suwayomi.tachidesk.manga.impl.backup.proto.models.Backup
+import suwayomi.tachidesk.manga.impl.backup.proto.models.BackupCategory
+import suwayomi.tachidesk.manga.impl.backup.proto.models.BackupChapter
+import suwayomi.tachidesk.manga.impl.backup.proto.models.BackupManga
+import suwayomi.tachidesk.manga.impl.backup.proto.models.BackupSource
+import suwayomi.tachidesk.server.serverConfig
+import uy.kohesive.injekt.Injekt
+import uy.kohesive.injekt.api.get
+import uy.kohesive.injekt.injectLazy
+import kotlin.time.Duration.Companion.milliseconds
+import kotlin.time.Duration.Companion.seconds
+import kotlin.time.Instant
+
+object SyncYomiSyncService {
+    private val syncPreferences = Injekt.get<Application>().getSharedPreferences("sync", Context.MODE_PRIVATE)
+
+    private val network: NetworkHelper by injectLazy()
+    private val logger = KotlinLogging.logger {}
+
+    private class SyncYomiException(
+        message: String?,
+    ) : Exception(message)
+
+    @Serializable
+    private data class SyncEvent(
+        val event: SyncEventStatus,
+        val device_Name: String? = null,
+        val message: String? = null,
+    )
+
+    @Serializable
+    private enum class SyncEventStatus {
+        SYNC_STARTED,
+        SYNC_SUCCESS,
+        SYNC_FAILED,
+        SYNC_ERROR,
+        SYNC_CANCELLED,
+    }
+
+    suspend fun doSync(
+        syncData: SyncData,
+        startDate: Instant,
+        setSyncState: (SyncManager.SyncState) -> Unit,
+    ): Backup? {
+        reportSyncEvent(SyncEventStatus.SYNC_STARTED)
+        setSyncState(SyncManager.SyncState.Downloading(startDate))
+
+        return try {
+            val (remoteData, etag) = pullSyncData()
+
+            val finalSyncData =
+                if (remoteData != null) {
+                    require(etag.isNotEmpty()) { "ETag should never be empty if remote data is not null" }
+                    logger.debug { "Try update remote data with ETag($etag)" }
+                    setSyncState(SyncManager.SyncState.Merging(startDate))
+                    mergeSyncData(syncData, remoteData)
+                } else {
+                    // init or overwrite remote data
+                    logger.debug { "Try overwrite remote data with ETag($etag)" }
+                    syncData
+                }
+
+            if (finalSyncData.backup != null) {
+                setSyncState(SyncManager.SyncState.Uploading(startDate))
+            }
+
+            val success = pushSyncData(finalSyncData, etag)
+            if (success) {
+                reportSyncEvent(SyncEventStatus.SYNC_SUCCESS)
+            } else {
+                reportSyncEvent(SyncEventStatus.SYNC_FAILED, "Failed to push sync data")
+            }
+
+            finalSyncData.backup
+        } catch (e: Exception) {
+            if (e is CancellationException) {
+                reportSyncEvent(SyncEventStatus.SYNC_CANCELLED, e.message)
+                throw e
+            }
+            logger.error { "Error syncing: ${e.message}" }
+            reportSyncEvent(SyncEventStatus.SYNC_ERROR, e.message)
+            throw e
+        }
+    }
+
+    private suspend fun pullSyncData(): Pair<SyncData?, String> {
+        val host = serverConfig.syncYomiHost.value
+        val apiKey = serverConfig.syncYomiApiKey.value
+        val downloadUrl = "$host/api/sync/content"
+
+        val headersBuilder = Headers.Builder().add("X-API-Token", apiKey)
+        val lastETag = syncPreferences.getString("last_sync_etag", "") ?: ""
+        if (lastETag != "") {
+            headersBuilder.add("If-None-Match", lastETag)
+        }
+        val headers = headersBuilder.build()
+
+        val downloadRequest =
+            GET(
+                url = downloadUrl,
+                headers = headers,
+            )
+
+        val response = network.client.newCall(downloadRequest).await()
+
+        if (response.code == HttpStatus.NOT_MODIFIED.code) {
+            // not modified
+            require(lastETag.isNotEmpty())
+            logger.info { "Remote server not modified" }
+            return Pair(null, lastETag)
+        } else if (response.code == HttpStatus.NOT_FOUND.code) {
+            // maybe got deleted from remote
+            return Pair(null, "")
+        }
+
+        if (response.isSuccessful) {
+            val newETag =
+                response.headers["ETag"]
+                    ?.takeIf { it.isNotEmpty() } ?: throw SyncYomiException("Missing ETag")
+
+            val byteArray =
+                response.body.byteStream().use {
+                    return@use it.readBytes()
+                }
+
+            return try {
+                val backup = ProtoBuf.decodeFromByteArray(Backup.serializer(), byteArray)
+                return Pair(SyncData(backup = backup), newETag)
+            } catch (_: SerializationException) {
+                logger.info { "Bad content responsed from server" }
+                // the body is invalid
+                // return default value so we can overwrite it
+                Pair(null, "")
+            }
+        } else {
+            val responseBody = response.body.string()
+            logger.error { "SyncError: $responseBody" }
+            throw SyncYomiException("Failed to download sync data: $responseBody")
+        }
+    }
+
+    private suspend fun pushSyncData(
+        syncData: SyncData,
+        eTag: String,
+    ): Boolean {
+        val backup = syncData.backup ?: return true
+
+        val host = serverConfig.syncYomiHost.value
+        val apiKey = serverConfig.syncYomiApiKey.value
+        val uploadUrl = "$host/api/sync/content"
+
+        val headersBuilder = Headers.Builder().add("X-API-Token", apiKey)
+        if (eTag.isNotEmpty()) {
+            headersBuilder.add("If-Match", eTag)
+        }
+        val headers = headersBuilder.build()
+
+        // Set timeout to 30 seconds
+        val timeout = 30.seconds
+        val client =
+            network.client
+                .newBuilder()
+                .connectTimeout(timeout)
+                .readTimeout(timeout)
+                .writeTimeout(timeout)
+                .build()
+
+        val byteArray = ProtoBuf.encodeToByteArray(Backup.serializer(), backup)
+        if (byteArray.isEmpty()) {
+            throw IllegalStateException("Empty backup error")
+        }
+        val body = byteArray.toRequestBody("application/octet-stream".toMediaType())
+
+        val uploadRequest =
+            PUT(
+                url = uploadUrl,
+                headers = headers,
+                body = body,
+            )
+
+        val response = client.newCall(uploadRequest).await()
+
+        return if (response.isSuccessful) {
+            val newETag =
+                response.headers["ETag"]
+                    ?.takeIf { it.isNotEmpty() } ?: throw SyncYomiException("Missing ETag")
+            syncPreferences
+                .edit()
+                .putString("last_sync_etag", newETag)
+                .apply()
+            logger.debug { "SyncYomi sync completed" }
+            true
+        } else if (response.code == HttpStatus.PRECONDITION_FAILED.code) {
+            // other clients updated remote data, will try next time
+            logger.debug { "SyncYomi sync failed with 412" }
+            false
+        } else {
+            val responseBody = response.body.string()
+            logger.error { "SyncError: $responseBody" }
+            false
+        }
+    }
+
+    private suspend fun reportSyncEvent(
+        event: SyncEventStatus,
+        message: String? = null,
+    ) {
+        try {
+            val host = serverConfig.syncYomiHost.value
+            val apiKey = serverConfig.syncYomiApiKey.value
+            val url = "$host/api/sync/event"
+
+            val headers = Headers.Builder().add("X-API-Token", apiKey).build()
+
+            // Use a fixed server name.
+            val bodyObj =
+                SyncEvent(
+                    event = event,
+                    device_Name = "Suwayomi Server",
+                    message = message,
+                )
+
+            val jsonBody = Json.encodeToString(SyncEvent.serializer(), bodyObj)
+            val requestBody = jsonBody.toRequestBody("application/json; charset=utf-8".toMediaType())
+
+            val request =
+                POST(
+                    url = url,
+                    headers = headers,
+                    body = requestBody,
+                )
+
+            network.client
+                .newCall(request)
+                .await()
+                .close()
+        } catch (e: Exception) {
+            logger.error { "Failed to report sync event: ${e.message}" }
+        }
+    }
+
+    fun mergeSyncData(
+        localSyncData: SyncData,
+        remoteSyncData: SyncData,
+    ): SyncData {
+        val mergedCategoriesList =
+            mergeCategoriesLists(localSyncData.backup?.backupCategories, remoteSyncData.backup?.backupCategories)
+
+        val mergedMangaList =
+            mergeMangaLists(
+                localSyncData.backup?.backupManga,
+                remoteSyncData.backup?.backupManga,
+                localSyncData.backup?.backupCategories ?: emptyList(),
+                remoteSyncData.backup?.backupCategories ?: emptyList(),
+                mergedCategoriesList,
+            )
+
+        val mergedSourcesList =
+            mergeSourcesLists(localSyncData.backup?.backupSources, remoteSyncData.backup?.backupSources)
+
+        // Create the merged Backup object
+        val mergedBackup =
+            Backup(
+                backupManga = mergedMangaList,
+                backupCategories = mergedCategoriesList,
+                backupSources = mergedSourcesList,
+                meta = emptyMap(),
+                serverSettings = null,
+            )
+
+        // Create the merged SData object
+        return SyncData(
+            backup = mergedBackup,
+        )
+    }
+
+    private fun mergeMangaLists(
+        localMangaList: List<BackupManga>?,
+        remoteMangaList: List<BackupManga>?,
+        localCategories: List<BackupCategory>,
+        remoteCategories: List<BackupCategory>,
+        mergedCategories: List<BackupCategory>,
+    ): List<BackupManga> {
+        val localMangaListSafe = localMangaList.orEmpty()
+        val remoteMangaListSafe = remoteMangaList.orEmpty()
+
+        logger.debug { "Starting merge. Local list size: ${localMangaListSafe.size}, Remote list size: ${remoteMangaListSafe.size}" }
+
+        fun mangaCompositeKey(manga: BackupManga): String =
+            "${manga.source}|${manga.url}|${manga.title.lowercase().trim()}|${manga.author?.lowercase()?.trim()}"
+
+        // Create maps using composite keys
+        val localMangaMap = localMangaListSafe.associateBy { mangaCompositeKey(it) }
+        val remoteMangaMap = remoteMangaListSafe.associateBy { mangaCompositeKey(it) }
+
+        val localCategoriesMapByOrder = localCategories.associateBy { it.order }
+        val remoteCategoriesMapByOrder = remoteCategories.associateBy { it.order }
+        val mergedCategoriesMapByName = mergedCategories.associateBy { it.name }
+
+        fun updateCategories(
+            theManga: BackupManga,
+            theMap: Map<Int, BackupCategory>,
+        ): BackupManga =
+            theManga.copy(
+                categories =
+                    theManga.categories.mapNotNull {
+                        theMap[it]?.let { category ->
+                            mergedCategoriesMapByName[category.name]?.order
+                        }
+                    },
+            )
+
+        val lastSyncTime = syncPreferences.getLong("last_sync_timestamp", 0).milliseconds.inWholeSeconds
+
+        val mergedList =
+            (localMangaMap.keys + remoteMangaMap.keys).distinct().mapNotNull { compositeKey ->
+                val local = localMangaMap[compositeKey]
+                val remote = remoteMangaMap[compositeKey]
+
+                // New version comparison logic
+                when {
+                    local != null && remote == null -> {
+                        if (lastSyncTime == 0L || local.lastModifiedAt > lastSyncTime) {
+                            updateCategories(local, localCategoriesMapByOrder)
+                        } else {
+                            logger.debug { "Dropping local manga deleted on remote: ${local.title}." }
+                            null
+                        }
+                    }
+
+                    local == null && remote != null -> {
+                        if (lastSyncTime == 0L || remote.lastModifiedAt > lastSyncTime) {
+                            updateCategories(remote, remoteCategoriesMapByOrder)
+                        } else {
+                            logger.debug { "Dropping deleted remote manga: ${remote.title}." }
+                            null
+                        }
+                    }
+
+                    local != null && remote != null -> {
+                        // Compare versions to decide which manga to keep
+                        if (local.version >= remote.version) {
+                            logger.debug { "Keeping local version of ${local.title} with merged chapters." }
+                            updateCategories(
+                                local.copy(
+                                    chapters =
+                                        mergeChapters(
+                                            local.chapters,
+                                            remote.chapters,
+                                            lastSyncTime,
+                                            serverConfig.syncDataChapters.value,
+                                        ),
+                                ),
+                                localCategoriesMapByOrder,
+                            )
+                        } else {
+                            logger.debug { "Keeping remote version of ${remote.title} with merged chapters." }
+                            updateCategories(
+                                remote.copy(
+                                    chapters =
+                                        mergeChapters(
+                                            local.chapters,
+                                            remote.chapters,
+                                            lastSyncTime,
+                                            serverConfig.syncDataChapters.value,
+                                        ),
+                                ),
+                                remoteCategoriesMapByOrder,
+                            )
+                        }
+                    }
+
+                    else -> {
+                        null
+                    } // No manga found for key
+                }
+            }
+
+        // Counting favorites and non-favorites
+        val (favorites, nonFavorites) = mergedList.partition { it.favorite }
+
+        logger.debug {
+            "Merge completed. Total merged manga: ${mergedList.size}, Favorites: ${favorites.size}, Non-Favorites: ${nonFavorites.size}"
+        }
+
+        return mergedList
+    }
+
+    private fun mergeChapters(
+        localChapters: List<BackupChapter>,
+        remoteChapters: List<BackupChapter>,
+        lastSyncTime: Long,
+        syncingChapters: Boolean,
+    ): List<BackupChapter> {
+        if (!syncingChapters) {
+            return remoteChapters // If not syncing chapters, keep remote untouched
+        }
+
+        fun chapterCompositeKey(chapter: BackupChapter): String = "${chapter.url}|${chapter.name}|${chapter.chapterNumber}"
+
+        val localChapterMap = localChapters.associateBy { chapterCompositeKey(it) }
+        val remoteChapterMap = remoteChapters.associateBy { chapterCompositeKey(it) }
+
+        logger.debug { "Starting chapter merge. Local chapters: ${localChapters.size}, Remote chapters: ${remoteChapters.size}" }
+
+        // Merge both chapter maps based on version numbers
+        val mergedChapters =
+            (localChapterMap.keys + remoteChapterMap.keys).distinct().mapNotNull { compositeKey ->
+                val localChapter = localChapterMap[compositeKey]
+                val remoteChapter = remoteChapterMap[compositeKey]
+
+                logger.debug {
+                    "Processing chapter key: $compositeKey. Local chapter: ${localChapter != null}, Remote chapter: ${remoteChapter != null}"
+                }
+
+                when {
+                    localChapter != null && remoteChapter == null -> {
+                        if (lastSyncTime == 0L || localChapter.lastModifiedAt > lastSyncTime) {
+                            logger.debug { "Keeping local chapter: ${localChapter.name}." }
+                            localChapter
+                        } else {
+                            logger.debug { "Dropping local chapter deleted on remote: ${localChapter.name}." }
+                            null
+                        }
+                    }
+
+                    localChapter == null && remoteChapter != null -> {
+                        if (lastSyncTime == 0L || remoteChapter.lastModifiedAt > lastSyncTime) {
+                            logger.debug { "Taking remote chapter: ${remoteChapter.name}." }
+                            remoteChapter
+                        } else {
+                            logger.debug { "Dropping deleted remote chapter: ${remoteChapter.name}." }
+                            null
+                        }
+                    }
+
+                    localChapter != null && remoteChapter != null -> {
+                        // Use version number to decide which chapter to keep
+                        val chosenChapter =
+                            if (localChapter.version >= remoteChapter.version) {
+                                // If there are more chapter on remote, local sourceOrder will need to be updated to maintain correct source order.
+                                if (localChapters.size < remoteChapters.size) {
+                                    localChapter.copy(sourceOrder = remoteChapter.sourceOrder)
+                                } else {
+                                    localChapter
+                                }
+                            } else {
+                                remoteChapter
+                            }
+                        logger.debug {
+                            "Merging chapter: ${chosenChapter.name}. Chosen version from: ${if (localChapter.version >= remoteChapter.version) "Local" else "Remote"}, Local version: ${localChapter.version}, Remote version: ${remoteChapter.version}."
+                        }
+                        chosenChapter
+                    }
+
+                    else -> {
+                        logger.debug { "No chapter found for composite key: $compositeKey. Skipping." }
+                        null
+                    }
+                }
+            }
+
+        logger.debug { "Chapter merge completed. Total merged chapters: ${mergedChapters.size}" }
+
+        return mergedChapters
+    }
+
+    private fun mergeCategoriesLists(
+        localCategoriesList: List<BackupCategory>?,
+        remoteCategoriesList: List<BackupCategory>?,
+    ): List<BackupCategory> {
+        if (localCategoriesList == null) return remoteCategoriesList ?: emptyList()
+        if (remoteCategoriesList == null) return localCategoriesList
+        val result = mutableListOf<BackupCategory>()
+        val processedLocals = mutableSetOf<BackupCategory>()
+
+        val localMapByUid = localCategoriesList.filter { it.uid != 0L }.associateBy { it.uid }
+        val localMapByName = localCategoriesList.associateBy { it.name }
+
+        val lastSyncTime = syncPreferences.getLong("last_sync_timestamp", 0)
+
+        remoteCategoriesList.forEach { remote ->
+            var localMatch: BackupCategory? = null
+
+            // 1. Try match by UID
+            if (remote.uid != 0L) {
+                localMatch = localMapByUid[remote.uid]
+            }
+
+            // 2. Try match by Name (fallback)
+            if (localMatch == null) {
+                localMatch = localMapByName[remote.name]
+            }
+
+            if (localMatch != null) {
+                processedLocals.add(localMatch)
+                // Conflict resolution
+                if (localMatch.version >= remote.version) {
+                    logger.debug { "Keeping local category: ${localMatch.name} (UID: ${localMatch.uid})" }
+                    result.add(localMatch)
+                } else {
+                    logger.debug { "Keeping remote category: ${remote.name} (UID: ${remote.uid})" }
+                    // Preserve Local UID if Remote was 0
+                    if (remote.uid == 0L) {
+                        remote.uid = localMatch.uid
+                    }
+                    result.add(remote)
+                }
+            } else {
+                val remoteModifiedTimeMillis = remote.lastModifiedAt.seconds.inWholeMilliseconds
+                if (lastSyncTime == 0L || remoteModifiedTimeMillis > lastSyncTime) {
+                    logger.debug { "Adding new remote category: ${remote.name} (UID: ${remote.uid})" }
+                    result.add(remote)
+                } else {
+                    logger.debug { "Dropping deleted remote category: ${remote.name} (UID: ${remote.uid})" }
+                }
+            }
+        }
+
+        // Add remaining Local Categories
+        localCategoriesList.forEach { local ->
+            if (local !in processedLocals) {
+                val localModifiedTimeMillis = local.lastModifiedAt.seconds.inWholeMilliseconds
+                if (lastSyncTime == 0L || localModifiedTimeMillis > lastSyncTime) {
+                    logger.debug { "Keeping local only category: ${local.name} (UID: ${local.uid})" }
+                    result.add(local)
+                } else {
+                    logger.debug { "Dropping local category deleted on remote: ${local.name} (UID: ${local.uid})" }
+                }
+            }
+        }
+
+        return result.sortedBy { it.order }
+    }
+
+    private fun mergeSourcesLists(
+        localSources: List<BackupSource>?,
+        remoteSources: List<BackupSource>?,
+    ): List<BackupSource> {
+        // Create maps using sourceId as key
+        val localSourceMap = localSources?.associateBy { it.sourceId } ?: emptyMap()
+        val remoteSourceMap = remoteSources?.associateBy { it.sourceId } ?: emptyMap()
+
+        logger.debug { "Starting source merge. Local sources: ${localSources?.size}, Remote sources: ${remoteSources?.size}" }
+
+        // Merge both source maps
+        val mergedSources =
+            (localSourceMap.keys + remoteSourceMap.keys).distinct().mapNotNull { sourceId ->
+                val localSource = localSourceMap[sourceId]
+                val remoteSource = remoteSourceMap[sourceId]
+
+                logger.debug {
+                    "Processing source ID: $sourceId. Local source: ${localSource != null}, Remote source: ${remoteSource != null}"
+                }
+
+                when {
+                    localSource != null && remoteSource == null -> {
+                        logger.debug { "Using local source: ${localSource.name}." }
+                        localSource
+                    }
+
+                    remoteSource != null && localSource == null -> {
+                        logger.debug { "Using remote source: ${remoteSource.name}." }
+                        remoteSource
+                    }
+
+                    else -> {
+                        logger.debug { "Remote and local have the same source ID: $sourceId. Keeping local." }
+                        localSource
+                    }
+                }
+            }
+
+        logger.debug { "Source merge completed. Total merged sources: ${mergedSources.size}" }
+
+        return mergedSources
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/graphql/mutations/SyncMutation.kt

@@ -0,0 +1,28 @@
+package suwayomi.tachidesk.graphql.mutations
+
+import suwayomi.tachidesk.global.impl.sync.SyncManager
+import suwayomi.tachidesk.graphql.directives.RequireAuth
+import suwayomi.tachidesk.graphql.types.StartSyncResult
+
+class SyncMutation {
+    data class StartSyncInput(
+        val clientMutationId: String? = null,
+    )
+
+    data class StartSyncPayload(
+        val clientMutationId: String? = null,
+        val result: StartSyncResult,
+    )
+
+    @RequireAuth
+    fun startSync(input: StartSyncInput): StartSyncPayload {
+        val (clientMutationId) = input
+
+        val result = SyncManager.startSync()
+
+        return StartSyncPayload(
+            clientMutationId = clientMutationId,
+            result = result,
+        )
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/graphql/queries/SyncQuery.kt

@@ -0,0 +1,11 @@
+package suwayomi.tachidesk.graphql.queries
+
+import suwayomi.tachidesk.global.impl.sync.SyncManager
+import suwayomi.tachidesk.graphql.directives.RequireAuth
+import suwayomi.tachidesk.graphql.types.SyncStatus
+import suwayomi.tachidesk.graphql.types.toStatus
+
+class SyncQuery {
+    @RequireAuth
+    fun lastSyncStatus(): SyncStatus? = SyncManager.lastSyncState.value?.toStatus()
+}

server/src/main/kotlin/suwayomi/tachidesk/graphql/server/TachideskGraphQLSchema.kt

@@ -27,6 +27,7 @@ import suwayomi.tachidesk.graphql.mutations.MangaMutation
 import suwayomi.tachidesk.graphql.mutations.MetaMutation
 import suwayomi.tachidesk.graphql.mutations.SettingsMutation
 import suwayomi.tachidesk.graphql.mutations.SourceMutation
+import suwayomi.tachidesk.graphql.mutations.SyncMutation
 import suwayomi.tachidesk.graphql.mutations.TrackMutation
 import suwayomi.tachidesk.graphql.mutations.UpdateMutation
 import suwayomi.tachidesk.graphql.mutations.UserMutation
@@ -41,6 +42,7 @@ import suwayomi.tachidesk.graphql.queries.MangaQuery
 import suwayomi.tachidesk.graphql.queries.MetaQuery
 import suwayomi.tachidesk.graphql.queries.SettingsQuery
 import suwayomi.tachidesk.graphql.queries.SourceQuery
+import suwayomi.tachidesk.graphql.queries.SyncQuery
 import suwayomi.tachidesk.graphql.queries.TrackQuery
 import suwayomi.tachidesk.graphql.queries.UpdateQuery
 import suwayomi.tachidesk.graphql.server.primitives.Cursor
@@ -50,6 +52,7 @@ import suwayomi.tachidesk.graphql.server.primitives.GraphQLLongAsString
 import suwayomi.tachidesk.graphql.server.primitives.GraphQLUpload
 import suwayomi.tachidesk.graphql.subscriptions.DownloadSubscription
 import suwayomi.tachidesk.graphql.subscriptions.InfoSubscription
+import suwayomi.tachidesk.graphql.subscriptions.SyncSubscription
 import suwayomi.tachidesk.graphql.subscriptions.UpdateSubscription
 import kotlin.reflect.KClass
 import kotlin.reflect.KType
@@ -98,6 +101,7 @@ val schema =
                 TopLevelObject(MetaQuery()),
                 TopLevelObject(SettingsQuery()),
                 TopLevelObject(SourceQuery()),
+                TopLevelObject(SyncQuery()),
                 TopLevelObject(TrackQuery()),
                 TopLevelObject(UpdateQuery()),
             ),
@@ -114,6 +118,7 @@ val schema =
                 TopLevelObject(MangaMutation()),
                 TopLevelObject(MetaMutation()),
                 TopLevelObject(SettingsMutation()),
+                TopLevelObject(SyncMutation()),
                 TopLevelObject(SourceMutation()),
                 TopLevelObject(TrackMutation()),
                 TopLevelObject(UpdateMutation()),
@@ -123,6 +128,7 @@ val schema =
             listOf(
                 TopLevelObject(DownloadSubscription()),
                 TopLevelObject(InfoSubscription()),
+                TopLevelObject(SyncSubscription()),
                 TopLevelObject(UpdateSubscription()),
             ),
     )

server/src/main/kotlin/suwayomi/tachidesk/graphql/subscriptions/SyncSubscription.kt

@@ -0,0 +1,17 @@
+package suwayomi.tachidesk.graphql.subscriptions
+
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.filterNotNull
+import kotlinx.coroutines.flow.map
+import suwayomi.tachidesk.global.impl.sync.SyncManager
+import suwayomi.tachidesk.graphql.directives.RequireAuth
+import suwayomi.tachidesk.graphql.types.SyncStatus
+import suwayomi.tachidesk.graphql.types.toStatus
+
+class SyncSubscription {
+    @RequireAuth
+    fun syncStatusChanged(): Flow<SyncStatus> =
+        SyncManager.lastSyncState
+            .filterNotNull()
+            .map { it.toStatus() }
+}

server/src/main/kotlin/suwayomi/tachidesk/graphql/types/SyncType.kt

@@ -0,0 +1,91 @@
+package suwayomi.tachidesk.graphql.types
+
+import suwayomi.tachidesk.global.impl.sync.SyncManager
+
+enum class StartSyncResult {
+    SUCCESS,
+    SYNC_IN_PROGRESS,
+    SYNC_DISABLED,
+}
+
+enum class SyncState {
+    STARTED,
+    CREATING_BACKUP,
+    DOWNLOADING,
+    MERGING,
+    UPLOADING,
+    RESTORING,
+    SUCCESS,
+    ERROR,
+}
+
+data class SyncStatus(
+    val state: SyncState,
+    val startDate: Long,
+    val endDate: Long? = null,
+    val backupRestoreId: String? = null,
+    val errorMessage: String? = null,
+)
+
+fun SyncManager.SyncState.toStatus(): SyncStatus =
+    when (this) {
+        is SyncManager.SyncState.Started -> {
+            SyncStatus(
+                state = SyncState.STARTED,
+                startDate = startDate.toEpochMilliseconds(),
+            )
+        }
+
+        is SyncManager.SyncState.CreatingBackup -> {
+            SyncStatus(
+                state = SyncState.CREATING_BACKUP,
+                startDate = startDate.toEpochMilliseconds(),
+            )
+        }
+
+        is SyncManager.SyncState.Downloading -> {
+            SyncStatus(
+                state = SyncState.DOWNLOADING,
+                startDate = startDate.toEpochMilliseconds(),
+            )
+        }
+
+        is SyncManager.SyncState.Merging -> {
+            SyncStatus(
+                state = SyncState.MERGING,
+                startDate = startDate.toEpochMilliseconds(),
+            )
+        }
+
+        is SyncManager.SyncState.Uploading -> {
+            SyncStatus(
+                state = SyncState.UPLOADING,
+                startDate = startDate.toEpochMilliseconds(),
+            )
+        }
+
+        is SyncManager.SyncState.Restoring -> {
+            SyncStatus(
+                state = SyncState.RESTORING,
+                startDate = startDate.toEpochMilliseconds(),
+                backupRestoreId = restoreId,
+            )
+        }
+
+        is SyncManager.SyncState.Success -> {
+            SyncStatus(
+                state = SyncState.SUCCESS,
+                startDate = startDate.toEpochMilliseconds(),
+                endDate = endDate.toEpochMilliseconds(),
+            )
+        }
+
+        is SyncManager.SyncState.Error -> {
+            SyncStatus(
+                state = SyncState.ERROR,
+                startDate = startDate.toEpochMilliseconds(),
+                endDate = endDate.toEpochMilliseconds(),
+                errorMessage = message,
+            )
+        }
+    }

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/CategoryManga.kt

@@ -85,6 +85,12 @@ object CategoryManga {
         }
     }
 
+    fun removeMangaFromAllCategories(mangaId: Int) {
+        transaction {
+            CategoryMangaTable.deleteWhere { CategoryMangaTable.manga eq mangaId }
+        }
+    }
+
     /**
      * list of mangas that belong to a category
      */
@@ -111,12 +117,14 @@ object CategoryManga {
 
         val transform: (ResultRow) -> MangaDataClass = {
             // Map the data from the result row to the MangaDataClass
-            val dataClass = MangaTable.toDataClass(it)
-            dataClass.lastReadAt = it[lastReadAt]
-            dataClass.unreadCount = it[unreadCount]
-            dataClass.downloadCount = it[downloadedCount]
-            dataClass.chapterCount = it[chapterCount]
-            dataClass
+            MangaTable
+                .toDataClass(it)
+                .copy(
+                    lastReadAt = it[lastReadAt],
+                    unreadCount = it[unreadCount],
+                    downloadCount = it[downloadedCount],
+                    chapterCount = it[chapterCount],
+                )
         }
 
         return transaction {

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/Chapter.kt

@@ -104,9 +104,6 @@ object Chapter {
                     .associateBy({ it[ChapterTable.url] }, { it })
             }
 
-        val chapterIds = chapterList.map { dbChapterMap.getValue(it.url)[ChapterTable.id] }
-        val chapterMetas = getChaptersMetaMaps(chapterIds.map { it.value })
-
         return chapterList.mapIndexed { index, it ->
 
             val dbChapter = dbChapterMap.getValue(it.url)
@@ -128,8 +125,8 @@ object Chapter {
                 realUrl = dbChapter[ChapterTable.realUrl],
                 downloaded = dbChapter[ChapterTable.isDownloaded],
                 pageCount = dbChapter[ChapterTable.pageCount],
-                chapterCount = chapterList.size,
-                meta = chapterMetas.getValue(dbChapter[ChapterTable.id].value),
+                lastModifiedAt = dbChapter[ChapterTable.lastModifiedAt],
+                version = dbChapter[ChapterTable.version],
             )
         }
     }
@@ -192,7 +189,7 @@ object Chapter {
                     }
 
                 // new chapters after they have been added to the database for auto downloads
-                val insertedChapters = mutableListOf<ChapterDataClass>()
+                val insertedChapterIds = mutableListOf<Int>()
 
                 val chaptersToInsert = mutableListOf<ChapterDataClass>() // do not yet have an ID from the database
                 val chaptersToUpdate = mutableListOf<ChapterDataClass>()
@@ -279,6 +276,8 @@ object Chapter {
                                 this[ChapterTable.isRead] = false
                                 this[ChapterTable.isBookmarked] = false
                                 this[ChapterTable.isDownloaded] = false
+                                this[ChapterTable.lastModifiedAt] = chapter.lastModifiedAt
+                                this[ChapterTable.version] = chapter.version
                                 this[ChapterTable.pageCount] = -1
 
                                 // is recognized chapter number
@@ -305,7 +304,7 @@ object Chapter {
                                         }
                                     }
                                 }
-                            }.forEach { insertedChapters.add(ChapterTable.toDataClass(it)) }
+                            }.forEach { insertedChapterIds.add(it[ChapterTable.id].value) }
                     }
 
                     if (chaptersToUpdate.isNotEmpty()) {
@@ -322,6 +321,8 @@ object Chapter {
                                     this[ChapterTable.scanlator] = it.scanlator
                                     this[ChapterTable.sourceOrder] = it.index
                                     this[ChapterTable.realUrl] = it.realUrl
+                                    this[ChapterTable.lastModifiedAt] = it.lastModifiedAt
+                                    this[ChapterTable.version] = it.version
                                     this[ChapterTable.isDownloaded] = currentChapter.downloaded
                                     this[ChapterTable.pageCount] = currentChapter.pageCount
 
@@ -348,6 +349,13 @@ object Chapter {
                 }
 
                 if (manga.inLibrary) {
+                    // We have to query the inserted chapters to get the up-to-date data. I.e. "last_modified_at" is not returned by the insert statement, due to being set by a DB trigger
+                    val insertedChapters =
+                        transaction {
+                            ChapterTable.selectAll().where { ChapterTable.id inList insertedChapterIds }.map(
+                                ChapterTable::toDataClass,
+                            )
+                        }
                     downloadNewChapters(mangaId, currentLatestChapterNumber, numberOfCurrentChapters, insertedChapters)
                 }
 
@@ -605,7 +613,7 @@ object Chapter {
                 .withDefault { emptyMap() }
         }
 
-    fun getChapterMetaMap(chapter: EntityID<Int>): Map<String, String> =
+    fun getChapterMetaMap(chapter: Int): Map<String, String> =
         transaction {
             ChapterMetaTable
                 .selectAll()

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/ChapterDownloadHelper.kt

@@ -16,6 +16,7 @@ import suwayomi.tachidesk.manga.model.table.ChapterTable
 import suwayomi.tachidesk.manga.model.table.MangaTable
 import suwayomi.tachidesk.manga.model.table.toDataClass
 import suwayomi.tachidesk.server.serverConfig
+import xyz.nulldev.androidcompat.util.SafePath
 import java.io.File
 import java.io.InputStream
 
@@ -64,6 +65,11 @@ object ChapterDownloadHelper {
         chapterId: Int,
     ): Pair<InputStream, Long> = provider(mangaId, chapterId).getAsArchiveStream()
 
+    fun getChapterArchiveSize(
+        mangaId: Int,
+        chapterId: Int,
+    ): Long = provider(mangaId, chapterId).getArchiveSize()
+
     private fun getChapterWithCbzFileName(chapterId: Int): Pair<ChapterDataClass, String> =
         transaction {
             val row =
@@ -71,13 +77,46 @@ object ChapterDownloadHelper {
                     .select(ChapterTable.columns + MangaTable.columns)
                     .where { ChapterTable.id eq chapterId }
                     .firstOrNull() ?: throw IllegalArgumentException("ChapterId $chapterId not found")
+
             val chapter = ChapterTable.toDataClass(row)
-            val mangaTitle = row[MangaTable.title]
+            val mangaTitle = row[MangaTable.title].trim()
 
-            val scanlatorPart = chapter.scanlator?.let { "[$it] " } ?: ""
-            val fileName = "$mangaTitle - $scanlatorPart${chapter.name}.cbz"
+            val scanlatorName = chapter.scanlator?.trim()?.takeIf { it.isNotEmpty() }
+            val chapterName = chapter.name.trim().takeIf { it.isNotEmpty() }
 
-            Pair(chapter, fileName)
+            val fileName =
+                buildString {
+                    append(mangaTitle)
+                    append(" - ")
+
+                    if (chapterName != null) {
+                        append(chapterName)
+                    } else if (chapter.chapterNumber >= 0f) {
+                        // chapterNumber is stored as Float, drop .0 for whole numbers.
+                        val formatNumber =
+                            if (chapter.chapterNumber % 1 == 0f) {
+                                chapter.chapterNumber.toInt().toString()
+                            } else {
+                                chapter.chapterNumber.toString()
+                            }
+                        append("#$formatNumber")
+                    } else {
+                        // Fallback when neither name nor valid chapter number exists
+                        append("#${chapter.index}")
+                    }
+
+                    if (scanlatorName != null) {
+                        append(" [")
+                        append(scanlatorName)
+                        append("]")
+                    }
+                    append(".cbz")
+                }
+
+            // Sanitize filename for OS compatibility
+            val safeFileName = SafePath.buildValidFilename(fileName)
+
+            Pair(chapter, safeFileName)
         }
 
     fun getCbzForDownload(

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/Manga.kt

@@ -92,13 +92,14 @@ object Manga {
                 inLibrary = mangaEntry[MangaTable.inLibrary],
                 inLibraryAt = mangaEntry[MangaTable.inLibraryAt],
                 source = getSource(mangaEntry[MangaTable.sourceReference]),
-                meta = getMangaMetaMap(mangaId),
                 realUrl = mangaEntry[MangaTable.realUrl],
                 lastFetchedAt = mangaEntry[MangaTable.lastFetchedAt],
                 chaptersLastFetchedAt = mangaEntry[MangaTable.chaptersLastFetchedAt],
                 updateStrategy = UpdateStrategy.valueOf(mangaEntry[MangaTable.updateStrategy]),
                 freshData = true,
                 trackers = Track.getTrackRecordsByMangaId(mangaId),
+                lastModifiedAt = mangaEntry[MangaTable.lastModifiedAt],
+                version = mangaEntry[MangaTable.version],
             )
         }
     }
@@ -211,12 +212,12 @@ object Manga {
                     .orderBy(ChapterTable.sourceOrder to SortOrder.DESC)
                     .firstOrNull { it[ChapterTable.isRead] }
 
-            mangaDaaClass.unreadCount = unreadCount
-            mangaDaaClass.downloadCount = downloadCount
-            mangaDaaClass.chapterCount = chapterCount
-            mangaDaaClass.lastChapterRead = lastChapterRead?.let { ChapterTable.toDataClass(it) }
-
-            mangaDaaClass
+            mangaDaaClass.copy(
+                unreadCount = unreadCount,
+                downloadCount = downloadCount,
+                chapterCount = chapterCount,
+                lastChapterRead = lastChapterRead?.let { ChapterTable.toDataClass(it) },
+            )
         }
     }
 
@@ -239,13 +240,14 @@ object Manga {
         inLibrary = mangaEntry[MangaTable.inLibrary],
         inLibraryAt = mangaEntry[MangaTable.inLibraryAt],
         source = getSource(mangaEntry[MangaTable.sourceReference]),
-        meta = getMangaMetaMap(mangaId),
         realUrl = mangaEntry[MangaTable.realUrl],
         lastFetchedAt = mangaEntry[MangaTable.lastFetchedAt],
         chaptersLastFetchedAt = mangaEntry[MangaTable.chaptersLastFetchedAt],
         updateStrategy = UpdateStrategy.valueOf(mangaEntry[MangaTable.updateStrategy]),
         freshData = false,
         trackers = Track.getTrackRecordsByMangaId(mangaId),
+        lastModifiedAt = mangaEntry[MangaTable.lastModifiedAt],
+        version = mangaEntry[MangaTable.version],
     )
 
     fun getMangaMetaMap(mangaId: Int): Map<String, String> =

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupExport.kt

@@ -148,13 +148,11 @@ object ProtoBackupExport : ProtoBackupBase() {
 
     fun createBackup(flags: BackupFlags): InputStream {
         // Create root object
-
-        val backupMangas = BackupMangaHandler.backup(flags)
-
         val backup: Backup =
             transaction {
+                val backupMangas = BackupMangaHandler.backup(flags)
                 Backup(
-                    BackupMangaHandler.backup(flags),
+                    backupMangas,
                     BackupCategoryHandler.backup(flags),
                     BackupSourceHandler.backup(backupMangas, flags),
                     BackupGlobalMetaHandler.backup(flags),

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt

@@ -21,6 +21,9 @@ import kotlinx.coroutines.sync.withLock
 import okio.buffer
 import okio.gzip
 import okio.source
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import org.jetbrains.exposed.v1.jdbc.update
 import suwayomi.tachidesk.graphql.types.toStatus
 import suwayomi.tachidesk.manga.impl.backup.BackupFlags
 import suwayomi.tachidesk.manga.impl.backup.proto.ProtoBackupValidator.ValidationResult
@@ -31,6 +34,8 @@ import suwayomi.tachidesk.manga.impl.backup.proto.handlers.BackupMangaHandler
 import suwayomi.tachidesk.manga.impl.backup.proto.handlers.BackupSettingsHandler
 import suwayomi.tachidesk.manga.impl.backup.proto.handlers.BackupSourceHandler
 import suwayomi.tachidesk.manga.impl.backup.proto.models.Backup
+import suwayomi.tachidesk.manga.model.table.ChapterTable
+import suwayomi.tachidesk.manga.model.table.MangaTable
 import java.io.InputStream
 import java.util.Date
 import java.util.Timer
@@ -109,6 +114,7 @@ object ProtoBackupImport : ProtoBackupBase() {
     fun restore(
         sourceStream: InputStream,
         flags: BackupFlags,
+        isSync: Boolean = false,
     ): String {
         val restoreId = System.currentTimeMillis().toString()
 
@@ -117,7 +123,7 @@ object ProtoBackupImport : ProtoBackupBase() {
         updateRestoreState(restoreId, BackupRestoreState.Idle)
 
         GlobalScope.launch {
-            restoreLegacy(sourceStream, restoreId, flags)
+            restoreLegacy(sourceStream, restoreId, flags, isSync)
         }
 
         return restoreId
@@ -127,11 +133,12 @@ object ProtoBackupImport : ProtoBackupBase() {
         sourceStream: InputStream,
         restoreId: String = "legacy",
         flags: BackupFlags = BackupFlags.DEFAULT,
+        isSync: Boolean = false,
     ): ValidationResult =
         backupMutex.withLock {
             try {
                 logger.info { "restore($restoreId): restoring..." }
-                performRestore(restoreId, sourceStream, flags)
+                performRestore(restoreId, sourceStream, flags, isSync)
             } catch (e: Exception) {
                 logger.error(e) { "restore($restoreId): failed due to" }
 
@@ -152,12 +159,14 @@ object ProtoBackupImport : ProtoBackupBase() {
         id: String,
         sourceStream: InputStream,
         flags: BackupFlags,
+        isSync: Boolean,
     ): ValidationResult {
         val backupString =
             sourceStream
                 .source()
-                .gzip()
-                .buffer()
+                .run {
+                    if (!isSync) gzip() else this
+                }.buffer()
                 .use { it.readByteArray() }
         val backup = parser.decodeFromByteArray(Backup.serializer(), backupString)
 
@@ -235,6 +244,17 @@ object ProtoBackupImport : ProtoBackupBase() {
             """.trimIndent()
         }
 
+        if (isSync) {
+            transaction {
+                MangaTable.update({ MangaTable.isSyncing eq true }) {
+                    it[isSyncing] = false
+                }
+                ChapterTable.update({ ChapterTable.isSyncing eq true }) {
+                    it[isSyncing] = false
+                }
+            }
+        }
+
         updateRestoreState(id, BackupRestoreState.Success)
 
         return validationResult

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/handlers/BackupCategoryHandler.kt

@@ -8,7 +8,11 @@ package suwayomi.tachidesk.manga.impl.backup.proto.handlers
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import org.jetbrains.exposed.v1.core.SortOrder
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.jdbc.insertAndGetId
 import org.jetbrains.exposed.v1.jdbc.selectAll
+import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import org.jetbrains.exposed.v1.jdbc.update
 import suwayomi.tachidesk.manga.impl.Category
 import suwayomi.tachidesk.manga.impl.Category.modifyCategoriesMetas
 import suwayomi.tachidesk.manga.impl.backup.BackupFlags
@@ -38,6 +42,9 @@ object BackupCategoryHandler {
                     it.name,
                     it.order,
                     0, // not supported in Tachidesk
+                    it.version,
+                    it.uid,
+                    it.lastModifiedAt,
                 ).apply {
                     this.meta = categoryToMeta[it.id] ?: emptyMap()
                 }
@@ -45,7 +52,56 @@ object BackupCategoryHandler {
         }
 
     fun restore(backupCategories: List<BackupCategory>): Map<Int, Int> {
-        val categoryIds = Category.createCategories(backupCategories.map { it.name })
+        val dbCategories = Category.getCategoryList()
+        val dbCategoriesByName = dbCategories.associateBy { it.name }
+        val dbCategoriesByUid = dbCategories.associateBy { it.uid }
+
+        var nextOrder = dbCategories.maxOfOrNull { it.order }?.plus(1) ?: 0
+
+        val categoryIds =
+            transaction {
+                backupCategories
+                    .map { backupCategory ->
+                        var dbCategory =
+                            if (backupCategory.uid != 0L) {
+                                dbCategoriesByUid[backupCategory.uid]
+                            } else {
+                                null
+                            }
+
+                        if (dbCategory == null) {
+                            dbCategory = dbCategoriesByName[backupCategory.name]
+                        }
+
+                        if (dbCategory != null) {
+                            CategoryTable.update({ CategoryTable.id eq dbCategory.id }) {
+                                it[name] = backupCategory.name
+                                it[order] = backupCategory.order
+                                it[version] = backupCategory.version
+                                it[uid] = if (backupCategory.uid != 0L) backupCategory.uid else dbCategory.uid
+                                it[lastModifiedAt] = backupCategory.lastModifiedAt
+                                it[isSyncing] = true
+                            }
+                            return@map dbCategory.id
+                        }
+
+                        val currentOrder = nextOrder++
+                        CategoryTable
+                            .insertAndGetId {
+                                it[name] = backupCategory.name
+                                it[order] = currentOrder
+                                it[version] = backupCategory.version
+                                it[uid] = backupCategory.uid
+                                it[lastModifiedAt] = backupCategory.lastModifiedAt
+                            }.value
+                    }
+            }
+
+        transaction {
+            CategoryTable.update({ CategoryTable.isSyncing eq true }) {
+                it[isSyncing] = false
+            }
+        }
 
         val metaEntryByCategoryId =
             categoryIds

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/handlers/BackupMangaHandler.kt

@@ -38,7 +38,6 @@ import suwayomi.tachidesk.manga.model.dataclass.TrackRecordDataClass
 import suwayomi.tachidesk.manga.model.table.ChapterTable
 import suwayomi.tachidesk.manga.model.table.MangaStatus
 import suwayomi.tachidesk.manga.model.table.MangaTable
-import suwayomi.tachidesk.manga.model.table.toDataClass
 import suwayomi.tachidesk.server.database.dbTransaction
 import java.util.Date
 import kotlin.math.max
@@ -75,6 +74,8 @@ object BackupMangaHandler {
                         dateAdded = mangaRow[MangaTable.inLibraryAt].seconds.inWholeMilliseconds,
                         viewer = 0, // not supported in Tachidesk
                         updateStrategy = UpdateStrategy.valueOf(mangaRow[MangaTable.updateStrategy]),
+                        lastModifiedAt = mangaRow[MangaTable.lastModifiedAt],
+                        version = mangaRow[MangaTable.version],
                     )
 
                 val mangaId = mangaRow[MangaTable.id].value
@@ -90,29 +91,31 @@ object BackupMangaHandler {
                                 .selectAll()
                                 .where { ChapterTable.manga eq mangaId }
                                 .orderBy(ChapterTable.sourceOrder to SortOrder.DESC)
-                                .map {
-                                    ChapterTable.toDataClass(it)
-                                }
+                                .toList()
                         }
+
                     if (flags.includeChapters) {
-                        val chapterToMeta = Chapter.getChaptersMetaMaps(chapters.map { it.id })
+                        val chapterToMeta =
+                            Chapter.getChaptersMetaMaps(chapters.map { it[ChapterTable.id].value })
 
                         backupManga.chapters =
                             chapters.map {
                                 BackupChapter(
-                                    it.url,
-                                    it.name,
-                                    it.scanlator,
-                                    it.read,
-                                    it.bookmarked,
-                                    it.lastPageRead,
-                                    it.fetchedAt.seconds.inWholeMilliseconds,
-                                    it.uploadDate,
-                                    it.chapterNumber,
-                                    chapters.size - it.index,
+                                    url = it[ChapterTable.url],
+                                    name = it[ChapterTable.name],
+                                    scanlator = it[ChapterTable.scanlator],
+                                    read = it[ChapterTable.isRead],
+                                    bookmark = it[ChapterTable.isBookmarked],
+                                    lastPageRead = it[ChapterTable.lastPageRead],
+                                    dateFetch = it[ChapterTable.fetchedAt].seconds.inWholeMilliseconds,
+                                    dateUpload = it[ChapterTable.date_upload],
+                                    chapterNumber = it[ChapterTable.chapter_number],
+                                    sourceOrder = chapters.size - it[ChapterTable.sourceOrder],
+                                    lastModifiedAt = it[ChapterTable.lastModifiedAt],
+                                    version = it[ChapterTable.version],
                                 ).apply {
                                     if (flags.includeClientData) {
-                                        this.meta = chapterToMeta[it.id] ?: emptyMap()
+                                        this.meta = chapterToMeta[it[ChapterTable.id].value] ?: emptyMap()
                                     }
                                 }
                             }
@@ -120,10 +123,10 @@ object BackupMangaHandler {
                     if (flags.includeHistory) {
                         backupManga.history =
                             chapters.mapNotNull {
-                                if (it.lastReadAt > 0) {
+                                if (it[ChapterTable.lastReadAt] > 0) {
                                     BackupHistory(
-                                        url = it.url,
-                                        lastRead = it.lastReadAt.seconds.inWholeMilliseconds,
+                                        url = it[ChapterTable.url],
+                                        lastRead = it[ChapterTable.lastReadAt].seconds.inWholeMilliseconds,
                                     )
                                 } else {
                                     null
@@ -232,6 +235,9 @@ object BackupMangaHandler {
                                 it[inLibrary] = manga.favorite
 
                                 it[inLibraryAt] = manga.dateAdded.milliseconds.inWholeSeconds
+
+                                it[lastModifiedAt] = manga.lastModifiedAt
+                                it[version] = manga.version
                             }.value
                     } else {
                         val dbMangaId = dbManga[MangaTable.id].value
@@ -251,6 +257,9 @@ object BackupMangaHandler {
                             it[inLibrary] = manga.favorite || dbManga[inLibrary]
 
                             it[inLibraryAt] = manga.dateAdded.milliseconds.inWholeSeconds
+
+                            it[lastModifiedAt] = manga.lastModifiedAt
+                            it[version] = manga.version
                         }
 
                         dbMangaId
@@ -268,7 +277,7 @@ object BackupMangaHandler {
                     restoreMangaChapterData(mangaId, restoreMode, chapters, history, flags)
                 }
 
-                // merge categories
+                // update categories
                 if (flags.includeCategories) {
                     restoreMangaCategoryData(mangaId, categoryIds)
                 }
@@ -339,6 +348,9 @@ object BackupMangaHandler {
                             this[ChapterTable.lastReadAt] =
                                 historyByChapter[chapter.url]?.maxOrNull()?.milliseconds?.inWholeSeconds ?: 0
                         }
+
+                        this[ChapterTable.lastModifiedAt] = chapter.lastModifiedAt
+                        this[ChapterTable.version] = chapter.version
                     }.map { it[ChapterTable.id].value }
             } else {
                 emptyList()
@@ -387,6 +399,7 @@ object BackupMangaHandler {
         mangaId: Int,
         categoryIds: List<Int>,
     ) {
+        CategoryManga.removeMangaFromAllCategories(mangaId)
         CategoryManga.addMangaToCategories(mangaId, categoryIds)
     }
 

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/models/BackupCategory.kt

@@ -10,6 +10,10 @@ class BackupCategory(
     // @ProtoNumber(3) val updateInterval: Int = 0, 1.x value not used in 0.x
     // Bump by 100 to specify this is a 0.x value
     @ProtoNumber(100) var flags: Int = 0,
+    // syncyomi
+    @ProtoNumber(601) var version: Long = 0,
+    @ProtoNumber(602) var uid: Long = 0,
+    @ProtoNumber(603) var lastModifiedAt: Long = 0,
     // suwayomi
     @ProtoNumber(9000) var meta: Map<String, String> = emptyMap(),
 )

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/models/BackupChapter.kt

@@ -19,6 +19,9 @@ data class BackupChapter(
     // chapterNumber is called number is 1.x
     @ProtoNumber(9) var chapterNumber: Float = 0F,
     @ProtoNumber(10) var sourceOrder: Int = 0,
+    // syncyomi
+    @ProtoNumber(11) var lastModifiedAt: Long = 0,
+    @ProtoNumber(12) var version: Long = 0,
     // suwayomi
     @ProtoNumber(9000) var meta: Map<String, String> = emptyMap(),
 )

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/models/BackupManga.kt

@@ -34,6 +34,9 @@ data class BackupManga(
     @ProtoNumber(103) var viewer_flags: Int? = null,
     @ProtoNumber(104) var history: List<BackupHistory> = emptyList(),
     @ProtoNumber(105) var updateStrategy: UpdateStrategy = UpdateStrategy.ALWAYS_UPDATE,
+    // syncyomi
+    @ProtoNumber(106) var lastModifiedAt: Long = 0,
+    @ProtoNumber(109) var version: Long = 0,
     // suwayomi
     @ProtoNumber(9000) var meta: Map<String, String> = emptyMap(),
 )

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/chapter/ChapterForDownload.kt

@@ -31,6 +31,88 @@ import suwayomi.tachidesk.manga.model.table.PageTable
 import suwayomi.tachidesk.manga.model.table.toDataClass
 import kotlin.time.Duration.Companion.minutes
 
+/**
+ * Updates chapter download status and page count in the database if they differ from the file system.
+ */
+fun updateChapterPersistence(
+    chapterId: Int,
+    isMarkedAsDownloaded: Boolean,
+    dbPageCount: Int,
+    downloadPageCount: Int,
+    lastPageRead: Int,
+    logger: KLogger,
+): Boolean {
+    if (isMarkedAsDownloaded && dbPageCount == downloadPageCount) {
+        return false
+    }
+
+    return transaction {
+        var needsUpdate = false
+        if (!isMarkedAsDownloaded) {
+            logger.debug { "mark as downloaded" }
+            ChapterTable.update({ ChapterTable.id eq chapterId }) {
+                it[isDownloaded] = true
+            }
+            needsUpdate = true
+        }
+
+        if (dbPageCount != downloadPageCount) {
+            logger.debug { "use page count of downloaded chapter" }
+            ChapterTable.update({ ChapterTable.id eq chapterId }) {
+                it[pageCount] = downloadPageCount
+                it[ChapterTable.lastPageRead] = lastPageRead.coerceAtMost(downloadPageCount - 1).coerceAtLeast(0)
+            }
+            needsUpdate = true
+        }
+        needsUpdate
+    }
+}
+
+suspend fun refreshChapterPageList(
+    mangaId: Int,
+    chapterId: Int,
+    existingChapterEntry: ResultRow? = null,
+): Int {
+    val mutex = mutexByChapterId.get(chapterId) { Mutex() }
+    return mutex.withLock {
+        val chapterEntry = existingChapterEntry ?: transaction { ChapterTable.selectAll().where { ChapterTable.id eq chapterId }.first() }
+        val mangaEntry = transaction { MangaTable.selectAll().where { MangaTable.id eq mangaId }.first() }
+        val source = getCatalogueSourceOrStub(mangaEntry[MangaTable.sourceReference])
+
+        val pageList =
+            source
+                .getPageList(
+                    SChapter.create().apply {
+                        url = chapterEntry[ChapterTable.url]
+                        name = chapterEntry[ChapterTable.name]
+                        scanlator = chapterEntry[ChapterTable.scanlator]
+                        chapter_number = chapterEntry[ChapterTable.chapter_number]
+                        date_upload = chapterEntry[ChapterTable.date_upload]
+                    },
+                ).mapIndexed { index, page -> Page(index, page.url, page.imageUrl, page.uri) }
+
+        transaction {
+            ChapterTable.update({ ChapterTable.id eq chapterId }) {
+                it[isDownloaded] = false
+            }
+
+            PageTable.deleteWhere { PageTable.chapter eq chapterId }
+            PageTable.batchInsert(pageList) { page ->
+                this[PageTable.index] = page.index
+                this[PageTable.url] = page.url
+                this[PageTable.imageUrl] = page.imageUrl
+                this[PageTable.chapter] = chapterId
+            }
+
+            ChapterTable.update({ ChapterTable.id eq chapterId }) {
+                it[pageCount] = pageList.size
+                it[lastPageRead] = chapterEntry[ChapterTable.lastPageRead].coerceAtMost(pageList.size - 1).coerceAtLeast(0)
+            }
+        }
+        pageList.size
+    }
+}
+
 suspend fun getChapterDownloadReady(
     chapterId: Int? = null,
     chapterIndex: Int? = null,
@@ -68,56 +150,31 @@ private class ChapterForDownload(
     suspend fun asDownloadReady(): ChapterDataClass {
         val log = KotlinLogging.logger("${logger.name}::asDownloadReady")
 
-        val downloadPageCount =
-            try {
-                ChapterDownloadHelper.getImageCount(mangaId, chapterId)
-            } catch (_: Exception) {
-                0
-            }
+        val downloadPageCount = runCatching { ChapterDownloadHelper.getImageCount(mangaId, chapterId) }.getOrDefault(0)
         val isMarkedAsDownloaded = chapterEntry[ChapterTable.isDownloaded]
         val dbPageCount = chapterEntry[ChapterTable.pageCount]
         val doesDownloadExist = downloadPageCount != 0
-        val doPageCountsMatch = dbPageCount == downloadPageCount
 
         log.debug { "isMarkedAsDownloaded= $isMarkedAsDownloaded, dbPageCount= $dbPageCount, downloadPageCount= $downloadPageCount" }
 
         return if (!doesDownloadExist) {
             log.debug { "reset download status and fetch page list" }
-            updateDownloadStatusAndPageList(false)
+            refreshChapterPageList(mangaId, chapterId, chapterEntry)
+            chapterEntry = freshChapterEntry(optChapterId = chapterId)
+            ChapterTable.toDataClass(chapterEntry)
         } else {
-            transaction {
-                var needsUpdate = false
-
-                if (!isMarkedAsDownloaded) {
-                    log.debug { "mark as downloaded" }
-                    ChapterTable.update({ ChapterTable.id eq chapterId }) {
-                        it[isDownloaded] = true
-                    }
-                    needsUpdate = true
-                }
-
-                if (!doPageCountsMatch) {
-                    log.debug { "use page count of downloaded chapter" }
-                    ChapterTable.update({ ChapterTable.id eq chapterId }) {
-                        it[pageCount] = downloadPageCount
-                        it[lastPageRead] = chapterEntry[ChapterTable.lastPageRead].coerceAtMost(downloadPageCount - 1).coerceAtLeast(0)
-                    }
-                    needsUpdate = true
-                }
-
-                // Return updated chapter data
-                val updatedRow =
-                    ChapterTable
-                        .selectAll()
-                        .where { ChapterTable.id eq chapterId }
-                        .first()
-
-                if (needsUpdate) {
-                    chapterEntry = updatedRow
-                }
-
-                ChapterTable.toDataClass(updatedRow)
+            if (updateChapterPersistence(
+                    chapterId,
+                    isMarkedAsDownloaded,
+                    dbPageCount,
+                    downloadPageCount,
+                    chapterEntry[ChapterTable.lastPageRead],
+                    log,
+                )
+            ) {
+                chapterEntry = freshChapterEntry(optChapterId = chapterId)
             }
+            ChapterTable.toDataClass(chapterEntry)
         }
     }
 
@@ -150,59 +207,4 @@ private class ChapterForDownload(
                 }
             }.first()
     }
-
-    private suspend fun updateDownloadStatusAndPageList(downloaded: Boolean): ChapterDataClass {
-        val mutex = mutexByChapterId.get(chapterId) { Mutex() }
-        return mutex.withLock {
-            val pageList = fetchPageList()
-
-            transaction {
-                // Update download status
-                ChapterTable.update({ ChapterTable.id eq chapterId }) {
-                    it[isDownloaded] = downloaded
-                }
-
-                // Clear existing pages and insert new ones
-                PageTable.deleteWhere { PageTable.chapter eq chapterId }
-                PageTable.batchInsert(pageList) { page ->
-                    this[PageTable.index] = page.index
-                    this[PageTable.url] = page.url
-                    this[PageTable.imageUrl] = page.imageUrl
-                    this[PageTable.chapter] = chapterId
-                }
-
-                // Update page count
-                ChapterTable.update({ ChapterTable.id eq chapterId }) {
-                    it[pageCount] = pageList.size
-                    it[lastPageRead] = chapterEntry[ChapterTable.lastPageRead].coerceAtMost(pageList.size - 1).coerceAtLeast(0)
-                }
-
-                // Get updated chapter data
-                val updatedRow =
-                    ChapterTable
-                        .selectAll()
-                        .where { ChapterTable.id eq chapterId }
-                        .first()
-
-                chapterEntry = updatedRow
-                ChapterTable.toDataClass(updatedRow)
-            }
-        }
-    }
-
-    private suspend fun fetchPageList(): List<Page> {
-        val mangaEntry = transaction { MangaTable.selectAll().where { MangaTable.id eq mangaId }.first() }
-        val source = getCatalogueSourceOrStub(mangaEntry[MangaTable.sourceReference])
-
-        return source
-            .getPageList(
-                SChapter.create().apply {
-                    url = chapterEntry[ChapterTable.url]
-                    name = chapterEntry[ChapterTable.name]
-                    scanlator = chapterEntry[ChapterTable.scanlator]
-                    chapter_number = chapterEntry[ChapterTable.chapter_number]
-                    date_upload = chapterEntry[ChapterTable.date_upload]
-                },
-            ).mapIndexed { index, page -> Page(index, page.url, page.imageUrl, page.uri) }
-    }
 }

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/sync/KoreaderSyncService.kt

@@ -127,29 +127,36 @@ object KoreaderSyncService {
             }
 
             val mangaId = chapterRow[ChapterTable.manga].value
+            val isDownloaded = chapterRow[ChapterTable.isDownloaded]
             val checksumMethod = serverConfig.koreaderSyncChecksumMethod.value
 
             val newHash =
                 when (checksumMethod) {
                     KoreaderSyncChecksumMethod.BINARY -> {
-                        logger.debug { "[KOSYNC HASH] No hash for chapterId=$chapterId. Generating from downloaded content." }
-                        try {
-                            // Always create a CBZ in memory if it doesn't exist
-                            val (stream, _) = ChapterDownloadHelper.getArchiveStreamWithSize(mangaId, chapterId)
-                            // Write the stream to a temp file for partial hashing
-                            val tempFile = File.createTempFile("kosync-hash-", ".cbz")
+                        // Only generate binary hash if the chapter is downloaded to avoid fetching missing files
+                        if (isDownloaded) {
+                            logger.debug { "[KOSYNC HASH] No hash for chapterId=$chapterId. Generating from downloaded content." }
                             try {
-                                tempFile.outputStream().use { fos ->
-                                    stream.use { it.copyTo(fos) }
+                                // Always create a CBZ in memory if it doesn't exist
+                                val (stream, _) = ChapterDownloadHelper.getArchiveStreamWithSize(mangaId, chapterId)
+                                // Write the stream to a temp file for partial hashing
+                                val tempFile = File.createTempFile("kosync-hash-", ".cbz")
+                                try {
+                                    tempFile.outputStream().use { fos ->
+                                        stream.use { it.copyTo(fos) }
+                                    }
+                                    // Use the same hashing method as for downloads
+                                    KoreaderHelper.hashContents(tempFile)
+                                } finally {
+                                    // Always delete the temp file
+                                    tempFile.delete()
                                 }
-                                // Use the same hashing method as for downloads
-                                KoreaderHelper.hashContents(tempFile)
-                            } finally {
-                                // Always delete the temp file
-                                tempFile.delete()
+                            } catch (e: Exception) {
+                                logger.warn(e) { "[KOSYNC HASH] Failed to generate archive stream for chapterId=$chapterId." }
+                                null
                             }
-                        } catch (e: Exception) {
-                            logger.warn(e) { "[KOSYNC HASH] Failed to generate archive stream for chapterId=$chapterId." }
+                        } else {
+                            logger.debug { "[KOSYNC HASH] Skipping binary hash for chapterId=$chapterId because it is not downloaded." }
                             null
                         }
                     }
@@ -175,7 +182,7 @@ object KoreaderSyncService {
                 }
                 logger.info { "[KOSYNC HASH] Generated and saved new hash for chapterId=$chapterId" }
             } else {
-                logger.warn { "[KOSYNC HASH] Hashing failed for chapterId=$chapterId." }
+                logger.warn { "[KOSYNC HASH] Hashing failed or skipped for chapterId=$chapterId." }
             }
             newHash
         }

server/src/main/kotlin/suwayomi/tachidesk/manga/impl/update/Updater.kt

@@ -28,6 +28,7 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.sync.Semaphore
 import kotlinx.coroutines.sync.withPermit
+import suwayomi.tachidesk.global.impl.sync.SyncManager
 import suwayomi.tachidesk.manga.impl.Category
 import suwayomi.tachidesk.manga.impl.CategoryManga
 import suwayomi.tachidesk.manga.impl.Chapter
@@ -337,90 +338,98 @@ class Updater : IUpdater {
         clear: Boolean?,
         forceAll: Boolean,
     ) {
-        saveLastUpdateTimestamp()
-
-        if (clear == true) {
-            reset()
-        }
-
-        val includeInUpdateStatusToCategoryMap = categories.groupBy { it.includeInUpdate }
-        val excludedCategories = includeInUpdateStatusToCategoryMap[IncludeOrExclude.EXCLUDE].orEmpty()
-        val includedCategories = includeInUpdateStatusToCategoryMap[IncludeOrExclude.INCLUDE].orEmpty()
-        val unsetCategories = includeInUpdateStatusToCategoryMap[IncludeOrExclude.UNSET].orEmpty()
-        val categoriesToUpdate =
-            if (forceAll) {
-                categories
-            } else {
-                includedCategories.ifEmpty { unsetCategories }
-            }
-        val skippedCategories = categories.subtract(categoriesToUpdate.toSet()).toList()
-        val updateStatusCategories =
-            mapOf(
-                Pair(CategoryUpdateStatus.UPDATING, categoriesToUpdate),
-                Pair(CategoryUpdateStatus.SKIPPED, skippedCategories),
-            )
-
-        logger.debug { "Updating categories: '${categoriesToUpdate.joinToString("', '") { it.name }}'" }
-
-        val categoriesToUpdateMangas =
-            categoriesToUpdate
-                .flatMap { CategoryManga.getCategoryMangaList(it.id) }
-                .distinctBy { it.id }
-        val mangasToCategoriesMap = CategoryManga.getMangasCategories(categoriesToUpdateMangas.map { it.id })
-        val mangasToUpdate =
-            categoriesToUpdateMangas
-                .asSequence()
-                .filter { it.updateStrategy == UpdateStrategy.ALWAYS_UPDATE }
-                .filter {
-                    if (serverConfig.excludeUnreadChapters.value) {
-                        (it.unreadCount ?: 0L) == 0L
-                    } else {
-                        true
-                    }
-                }.filter {
-                    if (it.initialized && serverConfig.excludeNotStarted.value) {
-                        it.lastReadAt != null
-                    } else {
-                        true
-                    }
-                }.filter {
-                    if (serverConfig.excludeCompleted.value) {
-                        it.status != MangaStatus.COMPLETED.name
-                    } else {
-                        true
-                    }
-                }.filter { forceAll || !excludedCategories.any { category -> mangasToCategoriesMap[it.id]?.contains(category) == true } }
-                .toList()
-        val skippedMangas = categoriesToUpdateMangas.subtract(mangasToUpdate.toSet()).toList()
-
-        this.updateStatusCategories = updateStatusCategories
-        this.updateStatusSkippedMangas = skippedMangas
-
-        if (mangasToUpdate.isEmpty()) {
-            // In case no manga gets updated and no update job was running before, the client would never receive an info
-            // about its update request
-            scope.launch {
-                updateStatus(immediate = true)
-            }
-            return
-        }
-
         scope.launch {
-            updateStatus(
-                categoryUpdates =
-                    updateStatusCategories[CategoryUpdateStatus.UPDATING]
-                        ?.map {
-                            CategoryUpdateJob(it, CategoryUpdateStatus.UPDATING)
-                        }.orEmpty(),
-                mangaUpdates = mangasToUpdate.map { UpdateJob(it) },
-                isRunning = true,
+            SyncManager.ensureSync()
+
+            saveLastUpdateTimestamp()
+
+            if (clear == true) {
+                reset()
+            }
+
+            val includeInUpdateStatusToCategoryMap = categories.groupBy { it.includeInUpdate }
+            val excludedCategories = includeInUpdateStatusToCategoryMap[IncludeOrExclude.EXCLUDE].orEmpty()
+            val includedCategories = includeInUpdateStatusToCategoryMap[IncludeOrExclude.INCLUDE].orEmpty()
+            val unsetCategories = includeInUpdateStatusToCategoryMap[IncludeOrExclude.UNSET].orEmpty()
+            val categoriesToUpdate =
+                if (forceAll) {
+                    categories
+                } else {
+                    includedCategories.ifEmpty { unsetCategories }
+                }
+            val skippedCategories = categories.subtract(categoriesToUpdate.toSet()).toList()
+            val updateStatusCategories =
+                mapOf(
+                    Pair(CategoryUpdateStatus.UPDATING, categoriesToUpdate),
+                    Pair(CategoryUpdateStatus.SKIPPED, skippedCategories),
+                )
+
+            logger.debug { "Updating categories: '${categoriesToUpdate.joinToString("', '") { it.name }}'" }
+
+            val categoriesToUpdateMangas =
+                categoriesToUpdate
+                    .flatMap { CategoryManga.getCategoryMangaList(it.id) }
+                    .distinctBy { it.id }
+            val mangasToCategoriesMap = CategoryManga.getMangasCategories(categoriesToUpdateMangas.map { it.id })
+            val mangasToUpdate =
+                categoriesToUpdateMangas
+                    .asSequence()
+                    .filter { it.updateStrategy == UpdateStrategy.ALWAYS_UPDATE }
+                    .filter {
+                        if (serverConfig.excludeUnreadChapters.value) {
+                            (it.unreadCount ?: 0L) == 0L
+                        } else {
+                            true
+                        }
+                    }.filter {
+                        if (it.initialized && serverConfig.excludeNotStarted.value) {
+                            it.lastReadAt != null
+                        } else {
+                            true
+                        }
+                    }.filter {
+                        if (serverConfig.excludeCompleted.value) {
+                            it.status != MangaStatus.COMPLETED.name
+                        } else {
+                            true
+                        }
+                    }.filter {
+                        forceAll ||
+                            !excludedCategories.any { category ->
+                                mangasToCategoriesMap[it.id]?.contains(category) == true
+                            }
+                    }.toList()
+            val skippedMangas = categoriesToUpdateMangas.subtract(mangasToUpdate.toSet()).toList()
+
+            this@Updater.updateStatusCategories = updateStatusCategories
+            this@Updater.updateStatusSkippedMangas = skippedMangas
+
+            if (mangasToUpdate.isEmpty()) {
+                // In case no manga gets updated and no update job was running before, the client would never receive an info
+                // about its update request
+                scope.launch {
+                    updateStatus(immediate = true)
+                }
+                return@launch
+            }
+
+            scope.launch {
+                updateStatus(
+                    categoryUpdates =
+                        updateStatusCategories[CategoryUpdateStatus.UPDATING]
+                            ?.map {
+                                CategoryUpdateJob(it, CategoryUpdateStatus.UPDATING)
+                            }.orEmpty(),
+                    mangaUpdates = mangasToUpdate.map { UpdateJob(it) },
+                    isRunning = true,
+                )
+            }
+
+            addMangasToQueue(
+                mangasToUpdate
+                    .sortedWith(compareBy(String.CASE_INSENSITIVE_ORDER, MangaDataClass::title)),
             )
         }
-
-        addMangasToQueue(
-            mangasToUpdate
-                .sortedWith(compareBy(String.CASE_INSENSITIVE_ORDER, MangaDataClass::title)),
-        )
     }
 
     override fun addMangasToQueue(mangas: List<MangaDataClass>) {

server/src/main/kotlin/suwayomi/tachidesk/manga/model/dataclass/CategoryDataClass.kt

@@ -1,6 +1,7 @@
 package suwayomi.tachidesk.manga.model.dataclass
 
 import com.fasterxml.jackson.annotation.JsonValue
+import suwayomi.tachidesk.manga.impl.Category
 
 /*
  * Copyright (C) Contributors to the Suwayomi project
@@ -18,7 +19,7 @@ enum class IncludeOrExclude(
     ;
 
     companion object {
-        fun fromValue(value: Int) = IncludeOrExclude.values().find { it.value == value } ?: UNSET
+        fun fromValue(value: Int) = entries.find { it.value == value } ?: UNSET
     }
 }
 
@@ -27,8 +28,19 @@ data class CategoryDataClass(
     val order: Int,
     val name: String,
     val default: Boolean,
-    val size: Int,
     val includeInUpdate: IncludeOrExclude,
     val includeInDownload: IncludeOrExclude,
-    val meta: Map<String, String> = emptyMap(),
-)
+    val version: Long,
+    val uid: Long,
+    val lastModifiedAt: Long,
+) {
+    @Deprecated("Remove with V1 Api")
+    val size: Int by lazy {
+        Category.getCategorySize(id)
+    }
+
+    @Deprecated("Remove with V1 Api")
+    val meta: Map<String, String> by lazy {
+        Category.getCategoryMetaMap(id)
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/manga/model/dataclass/ChapterDataClass.kt

@@ -1,6 +1,11 @@
 package suwayomi.tachidesk.manga.model.dataclass
 
 import eu.kanade.tachiyomi.source.model.SChapter
+import org.jetbrains.exposed.v1.core.eq
+import org.jetbrains.exposed.v1.jdbc.selectAll
+import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import suwayomi.tachidesk.manga.impl.Chapter.getChapterMetaMap
+import suwayomi.tachidesk.manga.model.table.ChapterTable
 
 /*
  * Copyright (C) Contributors to the Suwayomi project
@@ -36,10 +41,8 @@ data class ChapterDataClass(
     val downloaded: Boolean,
     /** used to construct pages in the front-end */
     val pageCount: Int = -1,
-    /** total chapter count, used to calculate if there's a next and prev chapter */
-    val chapterCount: Int? = null,
-    /** used to store client specific values */
-    val meta: Map<String, String> = emptyMap(),
+    val lastModifiedAt: Long = 0,
+    val version: Long = 0,
 ) {
     companion object {
         fun fromSChapter(
@@ -68,4 +71,20 @@ data class ChapterDataClass(
                 downloaded = false,
             )
     }
+
+    @Deprecated("Remove with V1 Api")
+    val chapterCount: Int by lazy {
+        transaction {
+            ChapterTable
+                .selectAll()
+                .where { ChapterTable.manga eq mangaId }
+                .count()
+                .toInt()
+        }
+    }
+
+    @Deprecated("Remove with V1 Api")
+    val meta: Map<String, String> by lazy {
+        getChapterMetaMap(id)
+    }
 }

server/src/main/kotlin/suwayomi/tachidesk/manga/model/dataclass/MangaDataClass.kt

@@ -8,6 +8,7 @@ package suwayomi.tachidesk.manga.model.dataclass
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
 import eu.kanade.tachiyomi.source.model.UpdateStrategy
+import suwayomi.tachidesk.manga.impl.Manga.getMangaMetaMap
 import suwayomi.tachidesk.manga.impl.util.lang.trimAll
 import suwayomi.tachidesk.manga.model.table.MangaStatus
 import java.time.Instant
@@ -28,23 +29,28 @@ data class MangaDataClass(
     val inLibrary: Boolean = false,
     val inLibraryAt: Long = 0,
     val source: SourceDataClass? = null,
-    /** meta data for clients */
-    val meta: Map<String, String> = emptyMap(),
     val realUrl: String? = null,
-    var lastFetchedAt: Long? = 0,
-    var chaptersLastFetchedAt: Long? = 0,
-    var updateStrategy: UpdateStrategy = UpdateStrategy.ALWAYS_UPDATE,
+    val lastFetchedAt: Long? = 0,
+    val chaptersLastFetchedAt: Long? = 0,
+    val updateStrategy: UpdateStrategy = UpdateStrategy.ALWAYS_UPDATE,
     val freshData: Boolean = false,
-    var unreadCount: Long? = null,
-    var downloadCount: Long? = null,
-    var chapterCount: Long? = null,
-    var lastReadAt: Long? = null,
-    var lastChapterRead: ChapterDataClass? = null,
+    val unreadCount: Long? = null,
+    val downloadCount: Long? = null,
+    val chapterCount: Long? = null,
+    val lastReadAt: Long? = null,
+    val lastChapterRead: ChapterDataClass? = null,
     val age: Long? = if (lastFetchedAt == null) 0 else Instant.now().epochSecond.minus(lastFetchedAt),
     val chaptersAge: Long? = if (chaptersLastFetchedAt == null) null else Instant.now().epochSecond.minus(chaptersLastFetchedAt),
     val trackers: List<MangaTrackerDataClass>? = null,
+    val lastModifiedAt: Long = 0,
+    val version: Long = 0,
 ) {
     override fun toString(): String = "\"$title\" (id= $id) (sourceId= $sourceId)"
+
+    @Deprecated("Remove with V1 Api")
+    val meta: Map<String, String> by lazy {
+        getMangaMetaMap(id)
+    }
 }
 
 data class PagedMangaListDataClass(

server/src/main/kotlin/suwayomi/tachidesk/manga/model/table/CategoryTable.kt

@@ -9,7 +9,6 @@ package suwayomi.tachidesk.manga.model.table
 
 import org.jetbrains.exposed.v1.core.ResultRow
 import org.jetbrains.exposed.v1.core.dao.id.IntIdTable
-import suwayomi.tachidesk.manga.impl.Category
 import suwayomi.tachidesk.manga.model.dataclass.CategoryDataClass
 import suwayomi.tachidesk.manga.model.dataclass.IncludeOrExclude
 
@@ -19,16 +18,22 @@ object CategoryTable : IntIdTable() {
     val isDefault = bool("is_default").default(false)
     val includeInUpdate = integer("include_in_update").default(IncludeOrExclude.UNSET.value)
     val includeInDownload = integer("include_in_download").default(IncludeOrExclude.UNSET.value)
+
+    val version = long("version").default(0)
+    val uid = long("uid").default(0)
+    val lastModifiedAt = long("last_modified_at").default(0)
+    val isSyncing = bool("is_syncing").default(false)
 }
 
 fun CategoryTable.toDataClass(categoryEntry: ResultRow) =
     CategoryDataClass(
-        categoryEntry[id].value,
-        categoryEntry[order],
-        categoryEntry[name],
-        categoryEntry[isDefault],
-        Category.getCategorySize(categoryEntry[id].value),
-        IncludeOrExclude.fromValue(categoryEntry[includeInUpdate]),
-        IncludeOrExclude.fromValue(categoryEntry[includeInDownload]),
-        Category.getCategoryMetaMap(categoryEntry[id].value),
+        id = categoryEntry[id].value,
+        order = categoryEntry[order],
+        name = categoryEntry[name],
+        default = categoryEntry[isDefault],
+        includeInUpdate = IncludeOrExclude.fromValue(categoryEntry[includeInUpdate]),
+        includeInDownload = IncludeOrExclude.fromValue(categoryEntry[includeInDownload]),
+        version = categoryEntry[version],
+        uid = categoryEntry[uid],
+        lastModifiedAt = categoryEntry[lastModifiedAt],
     )

server/src/main/kotlin/suwayomi/tachidesk/manga/model/table/ChapterTable.kt

@@ -10,10 +10,6 @@ package suwayomi.tachidesk.manga.model.table
 import org.jetbrains.exposed.v1.core.ReferenceOption
 import org.jetbrains.exposed.v1.core.ResultRow
 import org.jetbrains.exposed.v1.core.dao.id.IntIdTable
-import org.jetbrains.exposed.v1.core.eq
-import org.jetbrains.exposed.v1.jdbc.selectAll
-import org.jetbrains.exposed.v1.jdbc.transactions.transaction
-import suwayomi.tachidesk.manga.impl.Chapter.getChapterMetaMap
 import suwayomi.tachidesk.manga.model.dataclass.ChapterDataClass
 import suwayomi.tachidesk.manga.model.table.columns.truncatingVarchar
 
@@ -42,45 +38,30 @@ object ChapterTable : IntIdTable() {
     val manga = reference("manga", MangaTable, ReferenceOption.CASCADE)
 
     val koreaderHash = varchar("koreader_hash", 32).nullable()
+
+    val lastModifiedAt = long("last_modified_at").default(0)
+    val version = long("version").default(0)
+    val isSyncing = bool("is_syncing").default(false)
 }
 
-fun ChapterTable.toDataClass(
-    chapterEntry: ResultRow,
-    includeChapterCount: Boolean = true,
-    includeChapterMeta: Boolean = true,
-) = ChapterDataClass(
-    id = chapterEntry[id].value,
-    url = chapterEntry[url],
-    name = chapterEntry[name],
-    uploadDate = chapterEntry[date_upload],
-    chapterNumber = chapterEntry[chapter_number],
-    scanlator = chapterEntry[scanlator],
-    mangaId = chapterEntry[manga].value,
-    read = chapterEntry[isRead],
-    bookmarked = chapterEntry[isBookmarked],
-    lastPageRead = chapterEntry[lastPageRead],
-    lastReadAt = chapterEntry[lastReadAt],
-    index = chapterEntry[sourceOrder],
-    fetchedAt = chapterEntry[fetchedAt],
-    realUrl = chapterEntry[realUrl],
-    downloaded = chapterEntry[isDownloaded],
-    pageCount = chapterEntry[pageCount],
-    chapterCount =
-        if (includeChapterCount) {
-            transaction {
-                ChapterTable
-                    .selectAll()
-                    .where { manga eq chapterEntry[manga].value }
-                    .count()
-                    .toInt()
-            }
-        } else {
-            null
-        },
-    meta =
-        if (includeChapterMeta) {
-            getChapterMetaMap(chapterEntry[id])
-        } else {
-            emptyMap()
-        },
-)
+fun ChapterTable.toDataClass(chapterEntry: ResultRow) =
+    ChapterDataClass(
+        id = chapterEntry[id].value,
+        url = chapterEntry[url],
+        name = chapterEntry[name],
+        uploadDate = chapterEntry[date_upload],
+        chapterNumber = chapterEntry[chapter_number],
+        scanlator = chapterEntry[scanlator],
+        mangaId = chapterEntry[manga].value,
+        read = chapterEntry[isRead],
+        bookmarked = chapterEntry[isBookmarked],
+        lastPageRead = chapterEntry[lastPageRead],
+        lastReadAt = chapterEntry[lastReadAt],
+        index = chapterEntry[sourceOrder],
+        fetchedAt = chapterEntry[fetchedAt],
+        realUrl = chapterEntry[realUrl],
+        downloaded = chapterEntry[isDownloaded],
+        pageCount = chapterEntry[pageCount],
+        lastModifiedAt = chapterEntry[lastModifiedAt],
+        version = chapterEntry[version],
+    )

server/src/main/kotlin/suwayomi/tachidesk/manga/model/table/MangaTable.kt

@@ -11,11 +11,9 @@ import eu.kanade.tachiyomi.source.model.SManga
 import eu.kanade.tachiyomi.source.model.UpdateStrategy
 import org.jetbrains.exposed.v1.core.ResultRow
 import org.jetbrains.exposed.v1.core.dao.id.IntIdTable
-import suwayomi.tachidesk.manga.impl.Manga.getMangaMetaMap
 import suwayomi.tachidesk.manga.impl.MangaList.proxyThumbnailUrl
 import suwayomi.tachidesk.manga.model.dataclass.MangaDataClass
 import suwayomi.tachidesk.manga.model.dataclass.toGenreList
-import suwayomi.tachidesk.manga.model.table.MangaStatus.Companion
 import suwayomi.tachidesk.manga.model.table.columns.truncatingVarchar
 import suwayomi.tachidesk.manga.model.table.columns.unlimitedVarchar
 
@@ -46,37 +44,35 @@ object MangaTable : IntIdTable() {
     val chaptersLastFetchedAt = long("chapters_last_fetched_at").default(0)
 
     val updateStrategy = varchar("update_strategy", 256).default(UpdateStrategy.ALWAYS_UPDATE.name)
+
+    val lastModifiedAt = long("last_modified_at").default(0)
+    val version = long("version").default(0)
+    val isSyncing = bool("is_syncing").default(false)
 }
 
-fun MangaTable.toDataClass(
-    mangaEntry: ResultRow,
-    includeMangaMeta: Boolean = true,
-) = MangaDataClass(
-    id = mangaEntry[this.id].value,
-    sourceId = mangaEntry[sourceReference].toString(),
-    url = mangaEntry[url],
-    title = mangaEntry[title],
-    thumbnailUrl = proxyThumbnailUrl(mangaEntry[this.id].value),
-    thumbnailUrlLastFetched = mangaEntry[thumbnailUrlLastFetched],
-    initialized = mangaEntry[initialized],
-    artist = mangaEntry[artist],
-    author = mangaEntry[author],
-    description = mangaEntry[description],
-    genre = mangaEntry[genre].toGenreList(),
-    status = Companion.valueOf(mangaEntry[status]).name,
-    inLibrary = mangaEntry[inLibrary],
-    inLibraryAt = mangaEntry[inLibraryAt],
-    meta =
-        if (includeMangaMeta) {
-            getMangaMetaMap(mangaEntry[id].value)
-        } else {
-            emptyMap()
-        },
-    realUrl = mangaEntry[realUrl],
-    lastFetchedAt = mangaEntry[lastFetchedAt],
-    chaptersLastFetchedAt = mangaEntry[chaptersLastFetchedAt],
-    updateStrategy = UpdateStrategy.valueOf(mangaEntry[updateStrategy]),
-)
+fun MangaTable.toDataClass(mangaEntry: ResultRow) =
+    MangaDataClass(
+        id = mangaEntry[this.id].value,
+        sourceId = mangaEntry[sourceReference].toString(),
+        url = mangaEntry[url],
+        title = mangaEntry[title],
+        thumbnailUrl = proxyThumbnailUrl(mangaEntry[this.id].value),
+        thumbnailUrlLastFetched = mangaEntry[thumbnailUrlLastFetched],
+        initialized = mangaEntry[initialized],
+        artist = mangaEntry[artist],
+        author = mangaEntry[author],
+        description = mangaEntry[description],
+        genre = mangaEntry[genre].toGenreList(),
+        status = MangaStatus.valueOf(mangaEntry[status]).name,
+        inLibrary = mangaEntry[inLibrary],
+        inLibraryAt = mangaEntry[inLibraryAt],
+        realUrl = mangaEntry[realUrl],
+        lastFetchedAt = mangaEntry[lastFetchedAt],
+        chaptersLastFetchedAt = mangaEntry[chaptersLastFetchedAt],
+        updateStrategy = UpdateStrategy.valueOf(mangaEntry[updateStrategy]),
+        lastModifiedAt = mangaEntry[lastModifiedAt],
+        version = mangaEntry[version],
+    )
 
 enum class MangaStatus(
     val value: Int,

server/src/main/kotlin/suwayomi/tachidesk/opds/OpdsAPI.kt

@@ -13,18 +13,22 @@ object OpdsAPI {
             // OPDS Search Description Feed
             get("search", OpdsV1Controller.searchFeed)
 
-            // --- Main Navigation Feeds ---
-
-            // Explore Navigation Feed
-            get("explore", OpdsV1Controller.exploreSourcesFeed)
-
             // Reading History Acquisition Feed
             get("history", OpdsV1Controller.historyFeed)
 
             // Library Updates Acquisition Feed
             get("library-updates", OpdsV1Controller.libraryUpdatesFeed)
 
-            // --- Library-Specific Feeds ---
+            // --- Remote Catalog Exploration ---
+            // List of available online sources
+            get("explore", OpdsV1Controller.exploreSourcesFeed)
+
+            // Browse series from a specific online source
+            path("explore/source/{sourceId}") {
+                get(OpdsV1Controller.exploreSourceFeed)
+            }
+
+            // --- Library Navigation Feeds ---
             path("library") {
                 // All Series in Library / Search Results Feed (Acquisition)
                 get("series", OpdsV1Controller.seriesFeed)
@@ -32,11 +36,6 @@ object OpdsAPI {
                 // Library Sources Navigation Feed
                 get("sources", OpdsV1Controller.librarySourcesFeed)
 
-                // Library Source-Specific Series Acquisition Feed
-                path("source/{sourceId}") {
-                    get(OpdsV1Controller.librarySourceFeed)
-                }
-
                 // Library Categories Navigation Feed
                 get("categories", OpdsV1Controller.categoriesFeed)
 
@@ -50,26 +49,10 @@ object OpdsAPI {
                 get("languages", OpdsV1Controller.languagesFeed)
             }
 
-            // --- Explore-Specific Feeds ---
-
-            // All Sources Navigation Feed (Explore)
-            get("sources", OpdsV1Controller.exploreSourcesFeed)
-
-            // Source-Specific Series Acquisition Feed (Explore)
+            // --- Library Series Filters ---
+            // Source-Specific Series Acquisition Feed (Library)
             path("source/{sourceId}") {
-                get(OpdsV1Controller.exploreSourceFeed)
-            }
-
-            // --- Item-Specific Feeds (Apply to both Library and Explore contexts) ---
-
-            // Series Chapters Acquisition Feed
-            path("series/{seriesId}/chapters") {
-                get(OpdsV1Controller.seriesChaptersFeed)
-            }
-
-            // Chapter Metadata Acquisition Feed
-            path("series/{seriesId}/chapter/{chapterIndex}/metadata") {
-                get(OpdsV1Controller.chapterMetadataFeed)
+                get(OpdsV1Controller.librarySourceFeed)
             }
 
             // Category-Specific Series Acquisition Feed (Library)
@@ -91,6 +74,16 @@ object OpdsAPI {
             path("language/{langCode}") {
                 get(OpdsV1Controller.languageFeed)
             }
+
+            // --- Item Specific Feeds ---
+            // Series Chapters Acquisition Feed
+            path("series/{seriesId}/chapters") {
+                get(OpdsV1Controller.seriesChaptersFeed)
+            }
+            // Chapter Metadata Acquisition Feed
+            path("series/{seriesId}/chapter/{chapterIndex}/metadata") {
+                get(OpdsV1Controller.chapterMetadataFeed)
+            }
         }
     }
 }

server/src/main/kotlin/suwayomi/tachidesk/opds/controller/OpdsV1Controller.kt

@@ -32,21 +32,21 @@ object OpdsV1Controller {
      */
     private fun getLibraryFeed(
         ctx: Context,
-        pageNum: Int?,
+        locale: Locale,
         criteria: OpdsMangaFilter,
         isSearch: Boolean,
+        pageNum: Int,
     ) {
-        val locale: Locale = LocalizationHelper.ctxToLocale(ctx, ctx.queryParam("lang"))
         ctx.future {
             future {
                 OpdsFeedBuilder.getLibraryFeed(
-                    criteria = criteria,
-                    baseUrl = BASE_URL,
-                    pageNum = pageNum ?: 1,
-                    sort = criteria.sort,
-                    filter = criteria.filter,
-                    locale = locale,
-                    isSearch = isSearch,
+                    BASE_URL,
+                    locale,
+                    criteria,
+                    isSearch,
+                    pageNum,
+                    criteria.sort,
+                    criteria.filter,
                 )
             }.thenApply { xml ->
                 ctx.contentType(OPDS_MIME).result(xml)
@@ -94,7 +94,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getHistoryFeed(BASE_URL, pageNumber ?: 1, locale)
+                        OpdsFeedBuilder.getHistoryFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -139,6 +139,7 @@ object OpdsV1Controller {
     /**
      * Serves an acquisition feed for all series in the library or search results.
      * This endpoint handles both general library browsing and specific search queries.
+     * This is the ONLY feed that extracts all the cross-filters from the context.
      */
     val seriesFeed =
         handler(
@@ -157,29 +158,14 @@ object OpdsV1Controller {
                     val opdsSearchCriteria = OpdsSearchCriteria(query, author, title)
                     ctx.future {
                         future {
-                            OpdsFeedBuilder.getSearchFeed(opdsSearchCriteria, BASE_URL, pageNumber ?: 1, locale)
+                            OpdsFeedBuilder.getSearchFeed(BASE_URL, locale, opdsSearchCriteria, pageNumber ?: 1)
                         }.thenApply { xml ->
                             ctx.contentType(OPDS_MIME).result(xml)
                         }
                     }
                 } else {
-                    val criteria =
-                        OpdsMangaFilter(
-                            sourceId = ctx.queryParam("source_id")?.toLongOrNull(),
-                            categoryId = ctx.queryParam("category_id")?.toIntOrNull(),
-                            statusId = ctx.queryParam("status_id")?.toIntOrNull(),
-                            genre = ctx.queryParam("genre"),
-                            langCode = ctx.queryParam("lang_code"),
-                            sort = ctx.queryParam("sort"),
-                            filter = ctx.queryParam("filter"),
-                            primaryFilter = PrimaryFilterType.NONE,
-                        )
-                    getLibraryFeed(
-                        ctx,
-                        pageNumber,
-                        criteria,
-                        isSearch = false,
-                    )
+                    val criteria = OpdsMangaFilter.fromContext(ctx, PrimaryFilterType.NONE)
+                    getLibraryFeed(ctx, locale, criteria, false, pageNumber ?: 1)
                 }
             },
             withResults = { httpCode(HttpStatus.OK) },
@@ -203,7 +189,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getExploreSourcesFeed(BASE_URL, pageNumber ?: 1, locale)
+                        OpdsFeedBuilder.getExploreSourcesFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -230,7 +216,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getLibrarySourcesFeed(BASE_URL, pageNumber ?: 1, locale)
+                        OpdsFeedBuilder.getLibrarySourcesFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -257,7 +243,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getCategoriesFeed(BASE_URL, pageNumber ?: 1, locale)
+                        OpdsFeedBuilder.getCategoriesFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -284,7 +270,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getGenresFeed(BASE_URL, pageNumber ?: 1, locale)
+                        OpdsFeedBuilder.getGenresFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -298,6 +284,7 @@ object OpdsV1Controller {
      */
     val statusesFeed =
         handler(
+            queryParam<Int?>("pageNumber"),
             queryParam<String?>("lang"),
             documentWith = {
                 withOperation {
@@ -305,12 +292,12 @@ object OpdsV1Controller {
                     description("Navigation feed listing series publication statuses for the library.")
                 }
             },
-            behaviorOf = { ctx, lang ->
+            behaviorOf = { ctx, pageNumber, lang ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getStatusFeed(BASE_URL, 1, locale)
+                        OpdsFeedBuilder.getStatusFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -324,6 +311,7 @@ object OpdsV1Controller {
      */
     val languagesFeed =
         handler(
+            queryParam<Int?>("pageNumber"),
             queryParam<String?>("lang"),
             documentWith = {
                 withOperation {
@@ -331,12 +319,12 @@ object OpdsV1Controller {
                     description("Navigation feed listing available content languages for series in the library.")
                 }
             },
-            behaviorOf = { ctx, lang ->
+            behaviorOf = { ctx, pageNumber, lang ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getLanguagesFeed(BASE_URL, locale)
+                        OpdsFeedBuilder.getLanguagesFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -363,7 +351,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getLibraryUpdatesFeed(BASE_URL, pageNumber ?: 1, locale)
+                        OpdsFeedBuilder.getLibraryUpdatesFeed(BASE_URL, locale, pageNumber ?: 1)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -392,7 +380,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getExploreSourceFeed(sourceId, BASE_URL, pageNumber ?: 1, sort ?: "popular", locale)
+                        OpdsFeedBuilder.getExploreSourceFeed(BASE_URL, locale, sourceId, pageNumber ?: 1, sort ?: "popular")
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -425,8 +413,9 @@ object OpdsV1Controller {
             documentWith = { withOperation { summary("OPDS Library Source Specific Series Feed") } },
             behaviorOf = { ctx, sourceId ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
+                val locale: Locale = LocalizationHelper.ctxToLocale(ctx, ctx.queryParam("lang"))
                 val criteria = buildCriteriaFromContext(ctx, OpdsMangaFilter(sourceId = sourceId, primaryFilter = PrimaryFilterType.SOURCE))
-                getLibraryFeed(ctx, ctx.queryParam("pageNumber")?.toIntOrNull(), criteria, isSearch = false)
+                getLibraryFeed(ctx, locale, criteria, false, ctx.queryParam("pageNumber")?.toIntOrNull() ?: 1)
             },
             withResults = {
                 httpCode(HttpStatus.OK)
@@ -443,9 +432,10 @@ object OpdsV1Controller {
             documentWith = { withOperation { summary("OPDS Category Specific Series Feed") } },
             behaviorOf = { ctx, categoryId ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
+                val locale: Locale = LocalizationHelper.ctxToLocale(ctx, ctx.queryParam("lang"))
                 val criteria =
                     buildCriteriaFromContext(ctx, OpdsMangaFilter(categoryId = categoryId, primaryFilter = PrimaryFilterType.CATEGORY))
-                getLibraryFeed(ctx, ctx.queryParam("pageNumber")?.toIntOrNull(), criteria, isSearch = false)
+                getLibraryFeed(ctx, locale, criteria, false, ctx.queryParam("pageNumber")?.toIntOrNull() ?: 1)
             },
             withResults = {
                 httpCode(HttpStatus.OK)
@@ -462,8 +452,9 @@ object OpdsV1Controller {
             documentWith = { withOperation { summary("OPDS Genre Specific Series Feed") } },
             behaviorOf = { ctx, genre ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
+                val locale: Locale = LocalizationHelper.ctxToLocale(ctx, ctx.queryParam("lang"))
                 val criteria = buildCriteriaFromContext(ctx, OpdsMangaFilter(genre = genre, primaryFilter = PrimaryFilterType.GENRE))
-                getLibraryFeed(ctx, ctx.queryParam("pageNumber")?.toIntOrNull(), criteria, isSearch = false)
+                getLibraryFeed(ctx, locale, criteria, false, ctx.queryParam("pageNumber")?.toIntOrNull() ?: 1)
             },
             withResults = {
                 httpCode(HttpStatus.OK)
@@ -480,8 +471,9 @@ object OpdsV1Controller {
             documentWith = { withOperation { summary("OPDS Status Specific Series Feed") } },
             behaviorOf = { ctx, statusId ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
+                val locale: Locale = LocalizationHelper.ctxToLocale(ctx, ctx.queryParam("lang"))
                 val criteria = buildCriteriaFromContext(ctx, OpdsMangaFilter(statusId = statusId, primaryFilter = PrimaryFilterType.STATUS))
-                getLibraryFeed(ctx, ctx.queryParam("pageNumber")?.toIntOrNull(), criteria, isSearch = false)
+                getLibraryFeed(ctx, locale, criteria, false, ctx.queryParam("pageNumber")?.toIntOrNull() ?: 1)
             },
             withResults = {
                 httpCode(HttpStatus.OK)
@@ -503,9 +495,10 @@ object OpdsV1Controller {
             },
             behaviorOf = { ctx, langCode ->
                 ctx.getAttribute(Attribute.TachideskUser).requireUserWithBasicFallback(ctx)
+                val locale: Locale = LocalizationHelper.ctxToLocale(ctx, ctx.queryParam("lang"))
                 val criteria =
                     buildCriteriaFromContext(ctx, OpdsMangaFilter(langCode = langCode, primaryFilter = PrimaryFilterType.LANGUAGE))
-                getLibraryFeed(ctx, ctx.queryParam("pageNumber")?.toIntOrNull(), criteria, isSearch = false)
+                getLibraryFeed(ctx, locale, criteria, false, ctx.queryParam("pageNumber")?.toIntOrNull() ?: 1)
             },
             withResults = {
                 httpCode(HttpStatus.OK)
@@ -534,7 +527,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getSeriesChaptersFeed(seriesId, BASE_URL, pageNumber ?: 1, sort, filter, locale)
+                        OpdsFeedBuilder.getSeriesChaptersFeed(BASE_URL, locale, seriesId, pageNumber ?: 1, sort, filter)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }
@@ -565,7 +558,7 @@ object OpdsV1Controller {
                 val locale: Locale = LocalizationHelper.ctxToLocale(ctx, lang)
                 ctx.future {
                     future {
-                        OpdsFeedBuilder.getChapterMetadataFeed(seriesId, chapterIndex, BASE_URL, locale)
+                        OpdsFeedBuilder.getChapterMetadataFeed(BASE_URL, locale, seriesId, chapterIndex)
                     }.thenApply { xml ->
                         ctx.contentType(OPDS_MIME).result(xml)
                     }

server/src/main/kotlin/suwayomi/tachidesk/opds/dto/OpdsChapterListAcqEntry.kt

@@ -12,4 +12,6 @@ data class OpdsChapterListAcqEntry(
     val lastReadAt: Long,
     val sourceOrder: Int,
     val pageCount: Int, // Can be -1 if not known
+    val downloaded: Boolean,
+    val cbzFileSize: Long? = null,
 )

server/src/main/kotlin/suwayomi/tachidesk/opds/dto/OpdsChapterMetadataAcqEntry.kt

@@ -5,6 +5,7 @@ data class OpdsChapterMetadataAcqEntry(
     val mangaId: Int,
     val name: String,
     val uploadDate: Long,
+    val chapterNumber: Float, // Added to fallback chapter titles
     val scanlator: String?,
     val read: Boolean,
     val lastPageRead: Int,
@@ -13,4 +14,5 @@ data class OpdsChapterMetadataAcqEntry(
     val downloaded: Boolean,
     val pageCount: Int,
     val url: String?,
+    val cbzFileSize: Long? = null,
 )

server/src/main/kotlin/suwayomi/tachidesk/opds/dto/OpdsHistoryAcqEntry.kt

@@ -5,6 +5,7 @@ data class OpdsHistoryAcqEntry(
     val mangaTitle: String,
     val mangaAuthor: String?,
     val mangaId: Int,
+    val mangaTotalChapters: Long,
     val mangaSourceLang: String?,
     val mangaThumbnailUrl: String?,
 )

server/src/main/kotlin/suwayomi/tachidesk/opds/dto/OpdsLibraryUpdateAcqEntry.kt

@@ -5,6 +5,7 @@ data class OpdsLibraryUpdateAcqEntry(
     val mangaTitle: String,
     val mangaAuthor: String?,
     val mangaId: Int,
+    val mangaTotalChapters: Long,
     val mangaSourceLang: String?,
     val mangaThumbnailUrl: String?,
 )

server/src/main/kotlin/suwayomi/tachidesk/opds/dto/OpdsMangaDetails.kt

@@ -5,4 +5,5 @@ data class OpdsMangaDetails( // Kept name, it's specific enough
     val title: String,
     val thumbnailUrl: String?,
     val author: String?, // Added for chapter entry authors
+    val totalChapters: Long, // Added to determine if it's a oneshot
 )

server/src/main/kotlin/suwayomi/tachidesk/opds/dto/OpdsMangaFilter.kt

@@ -1,5 +1,6 @@
 package suwayomi.tachidesk.opds.dto
 
+import io.javalin.http.Context
 import suwayomi.tachidesk.opds.util.OpdsStringUtil.encodeForOpdsURL
 
 /**
@@ -69,4 +70,24 @@ data class OpdsMangaFilter(
             "genre" -> this.copy(genre = value)
             else -> this
         }
+
+    companion object {
+        /**
+         * Creates an OpdsMangaFilter directly from the Javalin Context, capturing all cross-filters.
+         */
+        fun fromContext(
+            ctx: Context,
+            primaryFilter: PrimaryFilterType = PrimaryFilterType.NONE,
+        ): OpdsMangaFilter =
+            OpdsMangaFilter(
+                sourceId = ctx.queryParam("source_id")?.toLongOrNull(),
+                categoryId = ctx.queryParam("category_id")?.toIntOrNull(),
+                statusId = ctx.queryParam("status_id")?.toIntOrNull(),
+                genre = ctx.queryParam("genre"),
+                langCode = ctx.queryParam("lang_code"),
+                sort = ctx.queryParam("sort"),
+                filter = ctx.queryParam("filter"),
+                primaryFilter = primaryFilter,
+            )
+    }
 }

server/src/main/kotlin/suwayomi/tachidesk/opds/impl/FeedBuilderInternal.kt

@@ -16,145 +16,131 @@ import kotlin.math.ceil
  */
 class FeedBuilderInternal(
     private val baseUrl: String,
+    private val locale: Locale,
     private val idPath: String,
     private val title: String,
-    private val locale: Locale,
     private val feedType: String,
-    private val pageNum: Int? = 1,
+    private val pageNum: Int? = null,
     private val explicitQueryParams: String? = null,
     private val currentSort: String? = null,
     private val currentFilter: String? = null,
     private val isSearchFeed: Boolean = false,
 ) {
-    private val opdsItemsPerPageBounded: Int
-        get() = serverConfig.opdsItemsPerPage.value
-
-    private val feedAuthor = OpdsAuthorXml("Suwayomi", "https://suwayomi.org/")
-    private val feedGeneratedAt: String = OpdsDateUtil.formatCurrentInstantForOpds()
-
     var totalResults: Long = 0
     var icon: String? = null
     val links = mutableListOf<OpdsLinkXml>()
     val entries = mutableListOf<OpdsEntryXml>()
 
-    private fun buildUrlWithParams(
-        baseHrefPath: String,
-        page: Int?,
-    ): String {
-        val sb = StringBuilder("$baseUrl/$baseHrefPath")
-        val queryParamsList = mutableListOf<String>()
+    private fun buildUrlWithParams(page: Int? = pageNum): String {
+        val queryParams =
+            listOfNotNull(
+                explicitQueryParams?.takeIf(String::isNotBlank),
+                page?.let { "pageNumber=$it" },
+                currentSort?.let { "sort=$it" },
+                currentFilter?.let { "filter=$it" },
+                "lang=${locale.toLanguageTag()}",
+            ).joinToString("&")
 
-        explicitQueryParams?.takeIf { it.isNotBlank() }?.let { queryParamsList.add(it) }
-        page?.let { queryParamsList.add("pageNumber=$it") }
-        currentSort?.let { queryParamsList.add("sort=$it") }
-        currentFilter?.let { queryParamsList.add("filter=$it") }
-        queryParamsList.add("lang=${locale.toLanguageTag()}")
-
-        if (queryParamsList.isNotEmpty()) {
-            sb.append("?").append(queryParamsList.joinToString("&"))
-        }
-        return sb.toString()
+        return "$baseUrl/$idPath" + if (queryParams.isNotEmpty()) "?$queryParams" else ""
     }
 
     fun build(): OpdsFeedXml {
-        val selfLinkHref = buildUrlWithParams(idPath, if (pageNum != null) pageNum else null)
-        val feedLinks = mutableListOf<OpdsLinkXml>()
-        feedLinks.addAll(this.links)
-
-        feedLinks.add(
-            OpdsLinkXml(OpdsConstants.LINK_REL_SELF, selfLinkHref, feedType, MR.strings.opds_linktitle_self_feed.localized(locale)),
-        )
-        feedLinks.add(
-            OpdsLinkXml(
-                OpdsConstants.LINK_REL_START,
-                "$baseUrl?lang=${locale.toLanguageTag()}",
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                MR.strings.opds_linktitle_catalog_root.localized(locale),
-            ),
-        )
-        feedLinks.add(
-            OpdsLinkXml(
-                OpdsConstants.LINK_REL_SEARCH,
-                "$baseUrl/search?lang=${locale.toLanguageTag()}",
-                OpdsConstants.TYPE_OPENSEARCH_DESCRIPTION,
-                MR.strings.opds_linktitle_search_catalog.localized(locale),
-            ),
-        )
-
-        // Add pagination links if needed
-        if (pageNum != null) {
-            val totalPages = ceil(totalResults.toDouble() / opdsItemsPerPageBounded).toInt()
-
-            if (totalPages > 1) {
-                val currentPage = pageNum.coerceAtLeast(1)
-
-                // Always add 'first' link when there are multiple pages
-                feedLinks.add(
-                    OpdsLinkXml(
-                        OpdsConstants.LINK_REL_FIRST,
-                        buildUrlWithParams(idPath, 1),
-                        feedType,
-                        MR.strings.opds_linktitle_first_page.localized(locale),
-                    ),
-                )
-
-                // Add 'prev' link if not on first page
-                if (currentPage > 1) {
-                    feedLinks.add(
-                        OpdsLinkXml(
-                            OpdsConstants.LINK_REL_PREV,
-                            buildUrlWithParams(idPath, currentPage - 1),
-                            feedType,
-                            MR.strings.opds_linktitle_previous_page.localized(locale),
-                        ),
-                    )
-                }
-
-                // Add 'next' link if not on last page
-                if (currentPage < totalPages) {
-                    feedLinks.add(
-                        OpdsLinkXml(
-                            OpdsConstants.LINK_REL_NEXT,
-                            buildUrlWithParams(idPath, currentPage + 1),
-                            feedType,
-                            MR.strings.opds_linktitle_next_page.localized(locale),
-                        ),
-                    )
-                }
-
-                // Always add 'last' link when there are multiple pages
-                feedLinks.add(
-                    OpdsLinkXml(
-                        OpdsConstants.LINK_REL_LAST,
-                        buildUrlWithParams(idPath, totalPages),
-                        feedType,
-                        MR.strings.opds_linktitle_last_page.localized(locale),
-                    ),
-                )
-            }
-        }
-
-        val urnParams = mutableListOf<String>()
-        urnParams.add(locale.toLanguageTag())
-        pageNum?.let { urnParams.add("page$it") }
-        explicitQueryParams?.let { urnParams.add(it.replace("&", ":").replace("=", "_")) }
-        currentSort?.let { urnParams.add("sort_$it") }
-        currentFilter?.let { urnParams.add("filter_$it") }
-        val urnSuffix = if (urnParams.isNotEmpty()) ":${urnParams.joinToString(":")}" else ""
-
-        val showOpenSearchFields = isSearchFeed && pageNum != null && totalResults > 0
+        val itemsPerPage = serverConfig.opdsItemsPerPage.value
+        val showOpenSearch = isSearchFeed && pageNum != null && totalResults > 0
+        val urnSuffix =
+            listOfNotNull(
+                locale.toLanguageTag(),
+                pageNum?.let { "page$it" },
+                explicitQueryParams?.replace("&", ":")?.replace("=", "_"),
+                currentSort?.let { "sort_$it" },
+                currentFilter?.let { "filter_$it" },
+            ).joinToString(":")
 
         return OpdsFeedXml(
-            id = "urn:suwayomi:feed:${idPath.replace('/',':')}$urnSuffix",
+            id = "urn:suwayomi:feed:${idPath.replace('/', ':')}${if (urnSuffix.isNotEmpty()) ":$urnSuffix" else ""}",
             title = title,
-            updated = feedGeneratedAt,
+            updated = OpdsDateUtil.formatCurrentInstantForOpds(),
             icon = icon,
-            author = feedAuthor,
-            links = feedLinks,
+            author = OpdsAuthorXml("Suwayomi", "https://suwayomi.org/"),
+            links =
+                buildList {
+                    addAll(this@FeedBuilderInternal.links)
+                    add(
+                        OpdsLinkXml(
+                            OpdsConstants.LINK_REL_SELF,
+                            buildUrlWithParams(),
+                            feedType,
+                            MR.strings.opds_linktitle_self_feed.localized(locale),
+                        ),
+                    )
+                    add(
+                        OpdsLinkXml(
+                            OpdsConstants.LINK_REL_START,
+                            "$baseUrl?lang=${locale.toLanguageTag()}",
+                            OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                            MR.strings.opds_linktitle_catalog_root.localized(locale),
+                        ),
+                    )
+                    add(
+                        OpdsLinkXml(
+                            OpdsConstants.LINK_REL_SEARCH,
+                            "$baseUrl/search?lang=${locale.toLanguageTag()}",
+                            OpdsConstants.TYPE_OPENSEARCH_DESCRIPTION,
+                            MR.strings.opds_linktitle_search_catalog.localized(locale),
+                        ),
+                    )
+
+                    if (pageNum != null) {
+                        val totalPages = ceil(totalResults.toDouble() / itemsPerPage).toInt()
+                        if (totalPages > 1) {
+                            val currentPage = pageNum.coerceAtLeast(1)
+                            add(
+                                OpdsLinkXml(
+                                    OpdsConstants.LINK_REL_FIRST,
+                                    buildUrlWithParams(1),
+                                    feedType,
+                                    MR.strings.opds_linktitle_first_page.localized(locale),
+                                ),
+                            )
+                            if (currentPage >
+                                1
+                            ) {
+                                add(
+                                    OpdsLinkXml(
+                                        OpdsConstants.LINK_REL_PREV,
+                                        buildUrlWithParams(currentPage - 1),
+                                        feedType,
+                                        MR.strings.opds_linktitle_previous_page.localized(locale),
+                                    ),
+                                )
+                            }
+                            if (currentPage <
+                                totalPages
+                            ) {
+                                add(
+                                    OpdsLinkXml(
+                                        OpdsConstants.LINK_REL_NEXT,
+                                        buildUrlWithParams(currentPage + 1),
+                                        feedType,
+                                        MR.strings.opds_linktitle_next_page.localized(locale),
+                                    ),
+                                )
+                            }
+                            add(
+                                OpdsLinkXml(
+                                    OpdsConstants.LINK_REL_LAST,
+                                    buildUrlWithParams(totalPages),
+                                    feedType,
+                                    MR.strings.opds_linktitle_last_page.localized(locale),
+                                ),
+                            )
+                        }
+                    }
+                },
             entries = entries,
-            totalResults = totalResults.takeIf { showOpenSearchFields },
-            itemsPerPage = if (showOpenSearchFields) opdsItemsPerPageBounded else null,
-            startIndex = if (showOpenSearchFields) ((pageNum - 1) * opdsItemsPerPageBounded) + 1 else null,
+            totalResults = totalResults.takeIf { showOpenSearch },
+            itemsPerPage = itemsPerPage.takeIf { showOpenSearch },
+            startIndex = if (showOpenSearch && pageNum != null) ((pageNum - 1) * itemsPerPage) + 1 else null,
         )
     }
 }

server/src/main/kotlin/suwayomi/tachidesk/opds/impl/OpdsEntryBuilder.kt

@@ -1,10 +1,7 @@
 package suwayomi.tachidesk.opds.impl
 
 import dev.icerock.moko.resources.StringResource
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
 import suwayomi.tachidesk.i18n.MR
-import suwayomi.tachidesk.manga.impl.ChapterDownloadHelper
 import suwayomi.tachidesk.manga.impl.MangaList.proxyThumbnailUrl
 import suwayomi.tachidesk.manga.impl.sync.KoreaderSyncService
 import suwayomi.tachidesk.manga.model.table.MangaStatus
@@ -93,15 +90,15 @@ object OpdsEntryBuilder {
 
     /**
      * Converts a manga data object into a full OPDS acquisition entry.
-     * @param entry The manga data object.
      * @param baseUrl The base URL for constructing links.
      * @param locale The locale for localization.
+     * @param entry The manga data object.
      * @return An [OpdsEntryXml] object representing the manga.
      */
     fun mangaAcqEntryToEntry(
-        entry: OpdsMangaAcqEntry,
         baseUrl: String,
         locale: Locale,
+        entry: OpdsMangaAcqEntry,
     ): OpdsEntryXml {
         val displayThumbnailUrl = entry.thumbnailUrl?.let { proxyThumbnailUrl(entry.id) }
         val categoryScheme = if (entry.inLibrary) "$baseUrl/library/genres" else "$baseUrl/genres"
@@ -152,40 +149,151 @@ object OpdsEntryBuilder {
         )
     }
 
+    /**
+     * Resolves the display title for a chapter, ensuring an empty name falls back to
+     * a generic "Chapter X" or "Oneshot" to keep the OPDS feed clean and usable.
+     */
+    private fun resolveChapterTitle(
+        chapterName: String,
+        chapterNumber: Float,
+        sourceOrder: Int,
+        totalChapters: Long,
+        locale: Locale,
+    ): String {
+        val trimmedName = chapterName.trim()
+        if (trimmedName.isNotEmpty()) {
+            return trimmedName
+        }
+        return if (totalChapters <= 1L) {
+            MR.strings.opds_chapter_title_oneshot.localized(locale)
+        } else {
+            val formatNumber =
+                if (chapterNumber >= 0f) {
+                    if (chapterNumber % 1 == 0f) chapterNumber.toInt().toString() else chapterNumber.toString()
+                } else {
+                    sourceOrder.toString()
+                }
+            MR.strings.opds_chapter_title_fallback.localized(locale, formatNumber)
+        }
+    }
+
     /**
      * Creates an OPDS entry for a chapter, including acquisition and streaming links.
+     * @param baseUrl The base URL for constructing links.
+     * @param locale The locale for localization.
      * @param chapter The chapter data object.
      * @param manga The parent manga's details.
-     * @param baseUrl The base URL for constructing links.
      * @param addMangaTitle Whether to prepend the manga title to the entry title.
-     * @param locale The locale for localization.
+     * @param skipMetadataFeed Whether to skip the metadata feed.
      * @return An [OpdsEntryXml] object for the chapter.
      */
     suspend fun createChapterListEntry(
+        baseUrl: String,
+        locale: Locale,
         chapter: OpdsChapterListAcqEntry,
         manga: OpdsMangaDetails,
-        baseUrl: String,
         addMangaTitle: Boolean,
-        locale: Locale,
+        skipMetadataFeed: Boolean,
     ): OpdsEntryXml {
+        var effectiveLastPageRead = chapter.lastPageRead
+        var effectiveLastReadAt = chapter.lastReadAt
+
+        if (skipMetadataFeed) {
+            val syncResult = KoreaderSyncService.checkAndPullProgress(chapter.id)
+
+            // If sync strategy dictates an update (e.g. KEEP_REMOTE), use remote data.
+            // If sync strategy is PROMPT (isConflict=true), we ignore it here (effectively KEEP_LOCAL/DISABLED)
+            // because we cannot show a prompt in the chapter list feed.
+            if (syncResult != null && syncResult.shouldUpdate) {
+                effectiveLastPageRead = syncResult.pageRead
+                effectiveLastReadAt = syncResult.timestamp
+            }
+        }
+
         val statusKey =
             when {
+                chapter.downloaded -> MR.strings.opds_chapter_status_downloaded
                 chapter.read -> MR.strings.opds_chapter_status_read
-                chapter.lastPageRead > 0 -> MR.strings.opds_chapter_status_in_progress
+                effectiveLastPageRead > 0 -> MR.strings.opds_chapter_status_in_progress
                 else -> MR.strings.opds_chapter_status_unread
             }
         val titlePrefix = statusKey.localized(locale)
-        val entryTitle = titlePrefix + (if (addMangaTitle) " ${manga.title}:" else "") + " ${chapter.name}"
+        val chapterName = resolveChapterTitle(chapter.name, chapter.chapterNumber, chapter.sourceOrder, manga.totalChapters, locale)
+        val entryTitle = titlePrefix + (if (addMangaTitle) " ${manga.title}:" else "") + " $chapterName"
         val details =
             buildString {
-                append(MR.strings.opds_chapter_details_base.localized(locale, manga.title, chapter.name))
+                append(MR.strings.opds_chapter_details_base.localized(locale, manga.title, chapterName))
                 chapter.scanlator?.takeIf { it.isNotBlank() }?.let {
                     append(MR.strings.opds_chapter_details_scanlator.localized(locale, it))
                 }
                 if (chapter.pageCount > 0) {
-                    append(MR.strings.opds_chapter_details_progress.localized(locale, chapter.lastPageRead, chapter.pageCount))
+                    append(MR.strings.opds_chapter_details_progress.localized(locale, effectiveLastPageRead, chapter.pageCount))
                 }
             }
+
+        val links = mutableListOf<OpdsLinkXml>()
+
+        if (skipMetadataFeed) {
+            // Provide Acquisition Link (Download CBZ) if downloaded
+            if (chapter.downloaded) {
+                links.add(
+                    OpdsLinkXml(
+                        OpdsConstants.LINK_REL_ACQUISITION_OPEN_ACCESS,
+                        "/api/v1/chapter/${chapter.id}/download?markAsRead=${serverConfig.opdsMarkAsReadOnDownload.value}",
+                        serverConfig.opdsCbzMimetype.value.mediaType,
+                        MR.strings.opds_linktitle_download_cbz.localized(locale),
+                        length = chapter.cbzFileSize,
+                    ),
+                )
+            }
+
+            // Provide Stream Link (OPDS-PSE) if page count is known
+            if (chapter.pageCount > 0) {
+                val basePageHref =
+                    "/api/v1/manga/${manga.id}/chapter/${chapter.sourceOrder}/page/{pageNumber}" +
+                        "?updateProgress=${serverConfig.opdsEnablePageReadProgress.value}&opds=true"
+
+                val titleRes =
+                    if (effectiveLastPageRead > 0) {
+                        MR.strings.opds_linktitle_stream_pages_continue
+                    } else {
+                        MR.strings.opds_linktitle_stream_pages_start
+                    }
+
+                links.add(
+                    OpdsLinkXml(
+                        rel = OpdsConstants.LINK_REL_PSE_STREAM,
+                        href = basePageHref,
+                        type = OpdsConstants.TYPE_IMAGE_JPEG,
+                        title = titleRes.localized(locale),
+                        pseCount = chapter.pageCount,
+                        pseLastRead = effectiveLastPageRead.takeIf { it > 0 },
+                        pseLastReadDate = effectiveLastReadAt.takeIf { it > 0 }?.let { OpdsDateUtil.formatEpochMillisForOpds(it * 1000) },
+                    ),
+                )
+
+                // Page 0 Cover
+                links.add(
+                    OpdsLinkXml(
+                        rel = OpdsConstants.LINK_REL_IMAGE,
+                        href = "/api/v1/manga/${manga.id}/chapter/${chapter.sourceOrder}/page/0",
+                        type = OpdsConstants.TYPE_IMAGE_JPEG,
+                        title = MR.strings.opds_linktitle_chapter_cover.localized(locale),
+                    ),
+                )
+            }
+        } else {
+            // Link to Metadata Feed
+            links.add(
+                OpdsLinkXml(
+                    rel = OpdsConstants.LINK_REL_SUBSECTION,
+                    href = "$baseUrl/series/${manga.id}/chapter/${chapter.sourceOrder}/metadata?lang=${locale.toLanguageTag()}",
+                    type = OpdsConstants.TYPE_ATOM_XML_ENTRY_PROFILE_OPDS,
+                    title = MR.strings.opds_linktitle_view_chapter_details.localized(locale),
+                ),
+            )
+        }
+
         return OpdsEntryXml(
             id = "urn:suwayomi:chapter:${chapter.id}",
             title = entryTitle,
@@ -196,33 +304,25 @@ object OpdsEntryBuilder {
                     chapter.scanlator?.takeIf { it.isNotBlank() }?.let { OpdsAuthorXml(name = it) },
                 ),
             summary = OpdsSummaryXml(value = details),
-            link =
-                listOf(
-                    OpdsLinkXml(
-                        rel = OpdsConstants.LINK_REL_SUBSECTION,
-                        href = "$baseUrl/series/${manga.id}/chapter/${chapter.sourceOrder}/metadata?lang=${locale.toLanguageTag()}",
-                        type = OpdsConstants.TYPE_ATOM_XML_ENTRY_PROFILE_OPDS,
-                        title = MR.strings.opds_linktitle_view_chapter_details.localized(locale),
-                    ),
-                ),
+            link = links,
         )
     }
 
     /**
      * Creates one or two OPDS entries for a chapter, handling synchronization conflicts internally.
      *
-     * @param chapter The chapter metadata object.
-     * @param manga The parent manga's details.
      * @param baseUrl The base URL for constructing links.
      * @param locale The locale for localization.
+     * @param chapter The chapter metadata object.
+     * @param manga The parent manga's details.
      * @return A `Pair` where the first element is the primary entry (always present) and the
      * second is an optional entry representing the remote progress in case of a conflict.
      */
     suspend fun createChapterMetadataEntries(
-        chapter: OpdsChapterMetadataAcqEntry,
-        manga: OpdsMangaDetails,
         baseUrl: String,
         locale: Locale,
+        chapter: OpdsChapterMetadataAcqEntry,
+        manga: OpdsMangaDetails,
     ): Pair<OpdsEntryXml, OpdsEntryXml?> {
         // Check remote progress before building the entry
         val syncResult = KoreaderSyncService.checkAndPullProgress(chapter.id)
@@ -234,20 +334,20 @@ object OpdsEntryBuilder {
             // Generate two entries: one for local progress and another for remote.
             val localEntry =
                 buildSingleChapterMetadataEntry(
-                    chapter,
-                    manga,
                     baseUrl,
                     locale,
+                    chapter,
+                    manga,
                     progressSource = ProgressSource.Local(chapter.lastPageRead, chapter.lastReadAt),
                     isConflict = true,
                 )
 
             val remoteEntry =
                 buildSingleChapterMetadataEntry(
-                    chapter,
-                    manga,
                     baseUrl,
                     locale,
+                    chapter,
+                    manga,
                     progressSource = ProgressSource.Remote(syncResult!!.pageRead, syncResult.timestamp, syncResult.device),
                     isConflict = true,
                 )
@@ -263,10 +363,10 @@ object OpdsEntryBuilder {
 
             val mainEntry =
                 buildSingleChapterMetadataEntry(
-                    chapter,
-                    manga,
                     baseUrl,
                     locale,
+                    chapter,
+                    manga,
                     progressSource = progressSource,
                     isConflict = false,
                 )
@@ -297,10 +397,10 @@ object OpdsEntryBuilder {
      * Helper function to build a single OpdsEntryXml for a chapter.
      */
     private suspend fun buildSingleChapterMetadataEntry(
-        chapter: OpdsChapterMetadataAcqEntry,
-        manga: OpdsMangaDetails,
         baseUrl: String,
         locale: Locale,
+        chapter: OpdsChapterMetadataAcqEntry,
+        manga: OpdsMangaDetails,
         progressSource: ProgressSource,
         isConflict: Boolean,
     ): OpdsEntryXml {
@@ -337,14 +437,7 @@ object OpdsEntryBuilder {
             }
 
         val entryTitle = "$titlePrefix ${chapter.name}"
-        val cbzFileSize =
-            if (chapter.downloaded) {
-                withContext(Dispatchers.IO) {
-                    runCatching { ChapterDownloadHelper.getArchiveStreamWithSize(manga.id, chapter.id).second }.getOrNull()
-                }
-            } else {
-                null
-            }
+        val cbzFileSize = chapter.cbzFileSize
 
         val links = mutableListOf<OpdsLinkXml>()
         chapter.url?.let {
@@ -449,8 +542,8 @@ object OpdsEntryBuilder {
     fun addSourceSortFacets(
         feedBuilder: FeedBuilderInternal,
         baseUrl: String,
-        currentSort: String,
         locale: Locale,
+        currentSort: String,
     ) {
         val sortGroup = MR.strings.opds_facetgroup_sort_order.localized(locale)
         val addFacet = { href: String, titleKey: StringResource, isActive: Boolean ->
@@ -475,9 +568,9 @@ object OpdsEntryBuilder {
     fun addChapterSortAndFilterFacets(
         feedBuilder: FeedBuilderInternal,
         baseUrl: String,
+        locale: Locale,
         currentSort: String,
         currentFilter: String,
-        locale: Locale,
         filterCounts: Map<String, Long>? = null,
     ) {
         val sortGroup = MR.strings.opds_facetgroup_sort_order.localized(locale)
@@ -554,15 +647,15 @@ object OpdsEntryBuilder {
     fun addLibraryFacets(
         feedBuilder: FeedBuilderInternal,
         baseUrl: String,
-        activeFilters: OpdsMangaFilter,
         locale: Locale,
+        activeFilters: OpdsMangaFilter,
     ) {
         val currentSort = activeFilters.sort ?: "alpha_asc"
         val currentFilter = activeFilters.filter ?: "all"
 
         val sortGroup = MR.strings.opds_facetgroup_sort_order.localized(locale)
         val filterGroup = MR.strings.opds_facetgroup_filter_content.localized(locale)
-        val filterCounts = MangaRepository.getLibraryFilterCounts()
+        val filterCounts = MangaRepository.getLibraryFilterCounts(activeFilters)
 
         val buildUrl = { newFilters: OpdsMangaFilter, newSort: String, newFilter: String ->
             val crossFilterParams = newFilters.toCrossFilterQueryParameters()
@@ -667,7 +760,7 @@ object OpdsEntryBuilder {
 
         // --- Cross-Filter Facets ---
         if (activeFilters.primaryFilter != PrimaryFilterType.SOURCE) {
-            val sources = NavigationRepository.getLibrarySources(1).first
+            val sources = NavigationRepository.getLibrarySources(pageNum = null, activeFilters = activeFilters).first
             addFacet(
                 feedBuilder,
                 buildUrl(activeFilters.without("source_id"), currentSort, currentFilter),
@@ -688,7 +781,7 @@ object OpdsEntryBuilder {
             }
         }
         if (activeFilters.primaryFilter != PrimaryFilterType.CATEGORY) {
-            val categories = NavigationRepository.getCategories(1).first
+            val categories = NavigationRepository.getCategories(pageNum = null, activeFilters = activeFilters).first
             addFacet(
                 feedBuilder,
                 buildUrl(activeFilters.without("category_id"), currentSort, currentFilter),
@@ -709,7 +802,7 @@ object OpdsEntryBuilder {
             }
         }
         if (activeFilters.primaryFilter != PrimaryFilterType.STATUS) {
-            val statuses = NavigationRepository.getStatuses(locale)
+            val statuses = NavigationRepository.getStatuses(locale, pageNum = null, activeFilters = activeFilters).first
             addFacet(
                 feedBuilder,
                 buildUrl(activeFilters.without("status_id"), currentSort, currentFilter),
@@ -730,7 +823,7 @@ object OpdsEntryBuilder {
             }
         }
         if (activeFilters.primaryFilter != PrimaryFilterType.LANGUAGE) {
-            val languages = NavigationRepository.getContentLanguages(locale)
+            val languages = NavigationRepository.getContentLanguages(locale, pageNum = null, activeFilters = activeFilters).first
             addFacet(
                 feedBuilder,
                 buildUrl(activeFilters.without("lang_code"), currentSort, currentFilter),
@@ -751,7 +844,7 @@ object OpdsEntryBuilder {
             }
         }
         if (activeFilters.primaryFilter != PrimaryFilterType.GENRE) {
-            val genres = NavigationRepository.getGenres(1, locale).first
+            val genres = NavigationRepository.getGenres(locale, pageNum = null, activeFilters = activeFilters).first
             addFacet(
                 feedBuilder,
                 buildUrl(activeFilters.without("genre"), currentSort, currentFilter),

server/src/main/kotlin/suwayomi/tachidesk/opds/impl/OpdsFeedBuilder.kt

@@ -17,6 +17,7 @@ import suwayomi.tachidesk.opds.repository.ChapterRepository
 import suwayomi.tachidesk.opds.repository.MangaRepository
 import suwayomi.tachidesk.opds.repository.NavigationRepository
 import suwayomi.tachidesk.opds.util.OpdsDateUtil
+import suwayomi.tachidesk.opds.util.OpdsStringUtil
 import suwayomi.tachidesk.opds.util.OpdsXmlUtil
 import suwayomi.tachidesk.server.serverConfig
 import java.util.Locale
@@ -40,12 +41,11 @@ object OpdsFeedBuilder {
         val navItems = NavigationRepository.getRootNavigationItems(locale)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "", // Root path is empty
-                MR.strings.opds_feeds_root.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                null,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "", // Root path is empty
+                title = MR.strings.opds_feeds_root.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
             )
         builder.totalResults = navItems.size.toLong()
         builder.entries.addAll(
@@ -73,30 +73,39 @@ object OpdsFeedBuilder {
     /**
      * Generates the history feed showing recently read chapters.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the history feed.
      */
     suspend fun getHistoryFeed(
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
         val (historyItems, total) = ChapterRepository.getHistory(pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "history",
-                MR.strings.opds_feeds_history_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "history",
+                title = MR.strings.opds_feeds_history_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = pageNum,
             )
         builder.totalResults = total
+        val skipMetadata = serverConfig.opdsSkipChapterMetadataFeed.value
         builder.entries.addAll(
             historyItems.map { item ->
-                val mangaDetails = OpdsMangaDetails(item.mangaId, item.mangaTitle, item.mangaThumbnailUrl, item.mangaAuthor)
-                OpdsEntryBuilder.createChapterListEntry(item.chapter, mangaDetails, baseUrl, true, locale)
+                val mangaDetails =
+                    OpdsMangaDetails(item.mangaId, item.mangaTitle, item.mangaThumbnailUrl, item.mangaAuthor, item.mangaTotalChapters)
+                OpdsEntryBuilder.createChapterListEntry(
+                    baseUrl,
+                    locale,
+                    item.chapter,
+                    mangaDetails,
+                    true,
+                    skipMetadata,
+                )
             },
         )
         return OpdsXmlUtil.serializeFeedToString(builder.build())
@@ -104,54 +113,55 @@ object OpdsFeedBuilder {
 
     /**
      * Generates a feed for search results based on the provided criteria.
-     * @param criteria The search criteria.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param criteria The search criteria.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the search results feed.
      */
     fun getSearchFeed(
-        criteria: OpdsSearchCriteria,
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        criteria: OpdsSearchCriteria,
+        pageNum: Int,
     ): String {
         val (mangaEntries, total) = MangaRepository.findMangaByCriteria(criteria)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library/series",
-                MR.strings.opds_feeds_search_results_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library/series",
+                title = MR.strings.opds_feeds_search_results_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = pageNum,
                 isSearchFeed = true,
             )
         builder.totalResults = total
-        builder.entries.addAll(mangaEntries.map { OpdsEntryBuilder.mangaAcqEntryToEntry(it, baseUrl, locale) })
+        builder.entries.addAll(mangaEntries.map { OpdsEntryBuilder.mangaAcqEntryToEntry(baseUrl, locale, it) })
         return OpdsXmlUtil.serializeFeedToString(builder.build())
     }
 
     /**
      * Generates a generic library feed based on various filtering and sorting criteria.
-     * @param criteria The filtering criteria.
      * @param baseUrl The base URL for constructing links.
+     * @param locale The locale for localization.
+     * @param criteria The filtering criteria.
+     * @param isSearch Indicates if it's a search feed.
      * @param pageNum The page number for pagination.
      * @param sort The sorting parameter.
      * @param filter The filtering parameter.
-     * @param locale The locale for localization.
      * @return An XML string representing the library feed.
      */
     fun getLibraryFeed(
-        criteria: OpdsMangaFilter,
         baseUrl: String,
+        locale: Locale,
+        criteria: OpdsMangaFilter,
+        isSearch: Boolean,
         pageNum: Int,
         sort: String?,
         filter: String?,
-        locale: Locale,
-        isSearch: Boolean,
     ): String {
-        val result = MangaRepository.getLibraryManga(pageNum, sort, filter, criteria)
+        val result = MangaRepository.getLibraryManga(criteria, pageNum, sort, filter)
 
         val feedTitle =
             when (criteria.primaryFilter) {
@@ -177,7 +187,12 @@ object OpdsFeedBuilder {
                 }
 
                 PrimaryFilterType.STATUS -> {
-                    val statusName = NavigationRepository.getStatuses(locale).find { it.id == criteria.statusId }?.title
+                    val statusName =
+                        NavigationRepository
+                            .getStatuses(locale, pageNum = null, activeFilters = criteria)
+                            .first
+                            .find { it.id == criteria.statusId }
+                            ?.title
                     MR.strings.opds_feeds_status_specific_title.localized(locale, statusName ?: criteria.statusId.toString())
                 }
 
@@ -193,7 +208,7 @@ object OpdsFeedBuilder {
 
         val feedUrl =
             when (criteria.primaryFilter) {
-                PrimaryFilterType.SOURCE -> "library/source/${criteria.sourceId}"
+                PrimaryFilterType.SOURCE -> "source/${criteria.sourceId}"
                 PrimaryFilterType.CATEGORY -> "category/${criteria.categoryId}"
                 PrimaryFilterType.GENRE -> "genre/${criteria.genre}"
                 PrimaryFilterType.STATUS -> "status/${criteria.statusId}"
@@ -203,23 +218,23 @@ object OpdsFeedBuilder {
 
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                feedUrl,
-                feedTitle,
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = feedUrl,
+                title = feedTitle,
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = pageNum,
+                explicitQueryParams = criteria.toCrossFilterQueryParameters(),
                 currentSort = criteria.sort,
                 currentFilter = criteria.filter,
-                explicitQueryParams = criteria.toCrossFilterQueryParameters(),
                 isSearchFeed = isSearch,
             )
         builder.totalResults = result.totalCount
 
         // Add all library facets (sort, filter, and cross-filtering)
-        OpdsEntryBuilder.addLibraryFacets(builder, baseUrl, criteria, locale)
+        OpdsEntryBuilder.addLibraryFacets(builder, baseUrl, locale, criteria)
 
-        builder.entries.addAll(result.mangaEntries.map { OpdsEntryBuilder.mangaAcqEntryToEntry(it, baseUrl, locale) })
+        builder.entries.addAll(result.mangaEntries.map { OpdsEntryBuilder.mangaAcqEntryToEntry(baseUrl, locale, it) })
 
         return OpdsXmlUtil.serializeFeedToString(builder.build())
     }
@@ -227,24 +242,24 @@ object OpdsFeedBuilder {
     /**
      * Generates a navigation feed listing all available sources for exploration.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the explore sources feed.
      */
     fun getExploreSourcesFeed(
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
         val (sourceNavEntries, total) = NavigationRepository.getExploreSources(pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "sources",
-                MR.strings.opds_feeds_sources_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "sources",
+                title = MR.strings.opds_feeds_sources_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                pageNum = pageNum,
             )
         builder.totalResults = total
         builder.entries.addAll(
@@ -257,7 +272,7 @@ object OpdsFeedBuilder {
                         listOf(
                             OpdsLinkXml(
                                 OpdsConstants.LINK_REL_SUBSECTION,
-                                "$baseUrl/source/${entry.id}?sort=popular&lang=${locale.toLanguageTag()}",
+                                "$baseUrl/explore/source/${entry.id}?sort=popular&lang=${locale.toLanguageTag()}",
                                 OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
                             ),
                         ),
@@ -270,24 +285,24 @@ object OpdsFeedBuilder {
     /**
      * Generates a navigation feed listing sources for series present in the library.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the library sources feed.
      */
     fun getLibrarySourcesFeed(
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
         val (sourceNavEntries, total) = NavigationRepository.getLibrarySources(pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library/sources",
-                MR.strings.opds_feeds_library_sources_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library/sources",
+                title = MR.strings.opds_feeds_library_sources_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                pageNum = pageNum,
             )
         builder.totalResults = total
         builder.entries.addAll(
@@ -300,7 +315,7 @@ object OpdsFeedBuilder {
                         listOf(
                             OpdsLinkXml(
                                 OpdsConstants.LINK_REL_SUBSECTION,
-                                "$baseUrl/library/source/${entry.id}?lang=${locale.toLanguageTag()}",
+                                "$baseUrl/source/${entry.id}?lang=${locale.toLanguageTag()}",
                                 OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
                                 entry.name,
                                 thrCount = entry.mangaCount?.toInt(),
@@ -314,78 +329,75 @@ object OpdsFeedBuilder {
 
     /**
      * Generates an acquisition feed for manga from a specific source (explore context).
-     * @param sourceId The ID of the source.
      * @param baseUrl The base URL for constructing links.
+     * @param locale The locale for localization.
+     * @param sourceId The ID of the source.
      * @param pageNum The page number for pagination.
      * @param sort The sorting parameter ('popular' or 'latest').
-     * @param locale The locale for localization.
      * @return An XML string representing the source-specific feed.
      */
     suspend fun getExploreSourceFeed(
-        sourceId: Long,
         baseUrl: String,
+        locale: Locale,
+        sourceId: Long,
         pageNum: Int,
         sort: String,
-        locale: Locale,
     ): String {
         val (mangaEntries, hasNextPage) = MangaRepository.getMangaBySource(sourceId, pageNum, sort)
-        val sourceNavEntry = NavigationRepository.getExploreSources(1).first.find { it.id == sourceId }
-        val sourceNameOrId = sourceNavEntry?.name ?: sourceId.toString()
+        val sourceInfo = NavigationRepository.getSourceDetails(sourceId)
+        val sourceName = sourceInfo?.first ?: sourceId.toString()
         val titleRes =
-            if (sort == "latest") {
+            if (sort ==
+                "latest"
+            ) {
                 MR.strings.opds_feeds_source_specific_latest_title
             } else {
                 MR.strings.opds_feeds_source_specific_popular_title
             }
-        val feedTitle = titleRes.localized(locale, sourceNameOrId)
-        val feedUrl = "source/$sourceId"
+        val feedTitle = titleRes.localized(locale, sourceName)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                feedUrl,
-                feedTitle,
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "explore/source/$sourceId",
+                title = feedTitle,
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = pageNum,
                 currentSort = sort,
             )
         builder.totalResults =
             if (hasNextPage) {
                 (pageNum * serverConfig.opdsItemsPerPage.value + 1).toLong()
             } else {
-                (
-                    (pageNum - 1) *
-                        serverConfig.opdsItemsPerPage.value +
-                        mangaEntries.size
-                ).toLong()
+                ((pageNum - 1) * serverConfig.opdsItemsPerPage.value + mangaEntries.size).toLong()
             }
-        builder.icon = sourceNavEntry?.iconUrl
-        OpdsEntryBuilder.addSourceSortFacets(builder, "$baseUrl/$feedUrl", sort, locale)
-        builder.entries.addAll(mangaEntries.map { OpdsEntryBuilder.mangaAcqEntryToEntry(it, baseUrl, locale) })
+        builder.icon = sourceInfo?.second
+        OpdsEntryBuilder.addSourceSortFacets(builder, "$baseUrl/explore/source/$sourceId", locale, sort)
+        builder.entries.addAll(mangaEntries.map { OpdsEntryBuilder.mangaAcqEntryToEntry(baseUrl, locale, it) })
         return OpdsXmlUtil.serializeFeedToString(builder.build())
     }
 
     /**
      * Generates a navigation feed for library categories.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the categories navigation feed.
      */
     fun getCategoriesFeed(
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
         val (categoryNavEntries, total) = NavigationRepository.getCategories(pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library/categories",
-                MR.strings.opds_feeds_categories_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library/categories",
+                title = MR.strings.opds_feeds_categories_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                pageNum = pageNum,
             )
         builder.totalResults = total
         builder.entries.addAll(
@@ -413,24 +425,24 @@ object OpdsFeedBuilder {
     /**
      * Generates a navigation feed for library genres.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the genres navigation feed.
      */
     fun getGenresFeed(
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
-        val (genreNavEntries, total) = NavigationRepository.getGenres(pageNum, locale)
+        val (genreNavEntries, total) = NavigationRepository.getGenres(locale, pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library/genres",
-                MR.strings.opds_feeds_genres_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library/genres",
+                title = MR.strings.opds_feeds_genres_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                pageNum = pageNum,
             )
         builder.totalResults = total
         builder.entries.addAll(
@@ -458,26 +470,26 @@ object OpdsFeedBuilder {
     /**
      * Generates a navigation feed for manga publication statuses.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number (currently unused).
      * @param locale The locale for localization.
+     * @param pageNum The page number (currently unused).
      * @return An XML string representing the status navigation feed.
      */
     fun getStatusFeed(
         baseUrl: String,
-        @Suppress("UNUSED_PARAMETER") pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
-        val statuses = NavigationRepository.getStatuses(locale)
+        val (statuses, total) = NavigationRepository.getStatuses(locale, pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library/statuses",
-                MR.strings.opds_feeds_status_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                null,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library/statuses",
+                title = MR.strings.opds_feeds_status_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                pageNum = pageNum,
             )
-        builder.totalResults = statuses.size.toLong()
+        builder.totalResults = total
         builder.entries.addAll(
             statuses.map { entry ->
                 OpdsEntryXml(
@@ -503,24 +515,26 @@ object OpdsFeedBuilder {
     /**
      * Generates a navigation feed for content languages available in the library.
      * @param baseUrl The base URL for constructing links.
-     * @param uiLocale The locale for the user interface.
+     * @param locale The locale for the user interface.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the languages navigation feed.
      */
     fun getLanguagesFeed(
         baseUrl: String,
-        uiLocale: Locale,
+        locale: Locale,
+        pageNum: Int,
     ): String {
-        val languages = NavigationRepository.getContentLanguages(uiLocale)
+        val (languages, total) = NavigationRepository.getContentLanguages(locale, pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library/languages",
-                MR.strings.opds_feeds_languages_title.localized(uiLocale),
-                uiLocale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
-                null,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library/languages",
+                title = MR.strings.opds_feeds_languages_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_NAVIGATION,
+                pageNum = pageNum,
             )
-        builder.totalResults = languages.size.toLong()
+        builder.totalResults = total
         builder.entries.addAll(
             languages.map { entry ->
                 OpdsEntryXml(
@@ -531,7 +545,7 @@ object OpdsFeedBuilder {
                         listOf(
                             OpdsLinkXml(
                                 OpdsConstants.LINK_REL_SUBSECTION,
-                                "$baseUrl/language/${entry.id}?lang=${uiLocale.toLanguageTag()}",
+                                "$baseUrl/language/${entry.id}?lang=${locale.toLanguageTag()}",
                                 OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
                                 entry.title,
                                 thrCount = entry.mangaCount.toInt(),
@@ -544,32 +558,41 @@ object OpdsFeedBuilder {
     }
 
     /**
-     * Generates an acquisition feed for recent chapter updates in the library.
+     * Generates an acquisition feed of recent chapter updates for series in the library.
      * @param baseUrl The base URL for constructing links.
-     * @param pageNum The page number for pagination.
      * @param locale The locale for localization.
+     * @param pageNum The page number for pagination.
      * @return An XML string representing the library updates feed.
      */
     suspend fun getLibraryUpdatesFeed(
         baseUrl: String,
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int,
     ): String {
         val (updateItems, total) = ChapterRepository.getLibraryUpdates(pageNum)
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "library-updates",
-                MR.strings.opds_feeds_library_updates_title.localized(locale),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "library-updates",
+                title = MR.strings.opds_feeds_library_updates_title.localized(locale),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = pageNum,
             )
         builder.totalResults = total
+        val skipMetadata = serverConfig.opdsSkipChapterMetadataFeed.value
         builder.entries.addAll(
             updateItems.map { item ->
-                val mangaDetails = OpdsMangaDetails(item.mangaId, item.mangaTitle, item.mangaThumbnailUrl, item.mangaAuthor)
-                OpdsEntryBuilder.createChapterListEntry(item.chapter, mangaDetails, baseUrl, true, locale)
+                val mangaDetails =
+                    OpdsMangaDetails(item.mangaId, item.mangaTitle, item.mangaThumbnailUrl, item.mangaAuthor, item.mangaTotalChapters)
+                OpdsEntryBuilder.createChapterListEntry(
+                    baseUrl,
+                    locale,
+                    item.chapter,
+                    mangaDetails,
+                    true,
+                    skipMetadata,
+                )
             },
         )
         return OpdsXmlUtil.serializeFeedToString(builder.build())
@@ -577,29 +600,29 @@ object OpdsFeedBuilder {
 
     /**
      * Generates an acquisition feed for all chapters of a specific manga.
-     * @param mangaId The ID of the manga.
      * @param baseUrl The base URL for constructing links.
+     * @param locale The locale for localization.
+     * @param mangaId The ID of the manga.
      * @param pageNum The page number for pagination.
      * @param sortParam The sorting parameter for chapters.
      * @param filterParam The filtering parameter for chapters.
-     * @param locale The locale for localization.
      * @return An XML string representing the series' chapters feed.
      */
     suspend fun getSeriesChaptersFeed(
-        mangaId: Int,
         baseUrl: String,
+        locale: Locale,
+        mangaId: Int,
         pageNum: Int,
         sortParam: String?,
         filterParam: String?,
-        locale: Locale,
     ): String {
         val mangaDetails =
             MangaRepository.getMangaDetails(mangaId)
                 ?: return buildNotFoundFeed(
                     baseUrl,
+                    locale,
                     "series/$mangaId/chapters",
                     MR.strings.opds_error_manga_not_found.localized(locale, mangaId),
-                    locale,
                 )
         val (sortColumn, currentSortOrder) =
             when (sortParam?.lowercase()) {
@@ -610,15 +633,27 @@ object OpdsFeedBuilder {
                 else -> ChapterTable.sourceOrder to (serverConfig.opdsChapterSortOrder.value)
             }
         val currentFilter = filterParam?.lowercase() ?: if (serverConfig.opdsShowOnlyUnreadChapters.value) "unread" else "all"
+        val skipMetadata = serverConfig.opdsSkipChapterMetadataFeed.value
         var (chapterEntries, totalChapters) =
             ChapterRepository.getChaptersForManga(
                 mangaId,
-                pageNum,
                 sortColumn,
                 currentSortOrder,
                 currentFilter,
+                pageNum,
+                skipMetadata,
             )
 
+        // Return a not-found feed if all available chapters are filtered out as unreachable
+        if (skipMetadata && chapterEntries.isEmpty() && totalChapters > 0L) {
+            return buildNotFoundFeed(
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "series/$mangaId/chapters",
+                title = MR.strings.opds_error_chapters_not_found.localized(locale, pageNum),
+            )
+        }
+
         // If no chapters are found in the database, attempt to fetch them from the source.
         if (chapterEntries.isEmpty() && totalChapters == 0L) {
             try {
@@ -629,10 +664,11 @@ object OpdsFeedBuilder {
                 val (refetchedChapters, refetchedTotal) =
                     ChapterRepository.getChaptersForManga(
                         mangaId,
-                        pageNum,
                         sortColumn,
                         currentSortOrder,
                         currentFilter,
+                        pageNum,
+                        skipMetadata,
                     )
                 chapterEntries = refetchedChapters
                 totalChapters = refetchedTotal
@@ -651,12 +687,12 @@ object OpdsFeedBuilder {
         val feedUrl = "series/$mangaId/chapters"
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                feedUrl,
-                MR.strings.opds_feeds_manga_chapters.localized(locale, mangaDetails.title),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                pageNum,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = feedUrl,
+                title = MR.strings.opds_feeds_manga_chapters.localized(locale, mangaDetails.title),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = pageNum,
                 currentSort = actualSortParamForLinks,
                 currentFilter = currentFilter,
             )
@@ -669,14 +705,21 @@ object OpdsFeedBuilder {
         OpdsEntryBuilder.addChapterSortAndFilterFacets(
             builder,
             "$baseUrl/$feedUrl",
+            locale,
             actualSortParamForLinks,
             currentFilter,
-            locale,
             filterCounts,
         )
         builder.entries.addAll(
             chapterEntries.map { chapter ->
-                OpdsEntryBuilder.createChapterListEntry(chapter, mangaDetails, baseUrl, false, locale)
+                OpdsEntryBuilder.createChapterListEntry(
+                    baseUrl,
+                    locale,
+                    chapter,
+                    mangaDetails,
+                    false,
+                    skipMetadata,
+                )
             },
         )
         return OpdsXmlUtil.serializeFeedToString(builder.build())
@@ -684,43 +727,43 @@ object OpdsFeedBuilder {
 
     /**
      * Generates an acquisition feed with detailed metadata for a single chapter.
-     * @param mangaId The ID of the manga.
-     * @param chapterSourceOrder The source order index of the chapter.
      * @param baseUrl The base URL for constructing links.
      * @param locale The locale for localization.
+     * @param mangaId The ID of the manga.
+     * @param chapterSourceOrder The source order index of the chapter.
      * @return An XML string representing the chapter's metadata feed.
      */
     suspend fun getChapterMetadataFeed(
-        mangaId: Int,
-        chapterSourceOrder: Int,
         baseUrl: String,
         locale: Locale,
+        mangaId: Int,
+        chapterSourceOrder: Int,
     ): String {
         val mangaDetails =
             MangaRepository.getMangaDetails(mangaId)
                 ?: return buildNotFoundFeed(
                     baseUrl,
+                    locale,
                     "series/$mangaId/chapter/$chapterSourceOrder/metadata",
                     MR.strings.opds_error_manga_not_found.localized(locale, mangaId),
-                    locale,
                 )
         val chapterMetadata =
             ChapterRepository.getChapterDetailsForMetadataFeed(mangaId, chapterSourceOrder)
                 ?: return buildNotFoundFeed(
                     baseUrl,
+                    locale,
                     "series/$mangaId/chapter/$chapterSourceOrder/metadata",
                     MR.strings.opds_error_chapter_not_found.localized(locale, chapterSourceOrder),
-                    locale,
                 )
 
         val builder =
             FeedBuilderInternal(
-                baseUrl,
-                "series/$mangaId/chapter/${chapterMetadata.sourceOrder}/metadata",
-                MR.strings.opds_feeds_chapter_details.localized(locale, mangaDetails.title, chapterMetadata.name),
-                locale,
-                OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
-                null,
+                baseUrl = baseUrl,
+                locale = locale,
+                idPath = "series/$mangaId/chapter/${chapterMetadata.sourceOrder}/metadata",
+                title = MR.strings.opds_feeds_chapter_details.localized(locale, mangaDetails.title, chapterMetadata.name),
+                feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+                pageNum = null,
             )
 
         mangaDetails.thumbnailUrl?.let { proxyThumbnailUrl(mangaDetails.id) }?.also {
@@ -731,10 +774,10 @@ object OpdsFeedBuilder {
 
         val (primaryEntry, conflictEntry) =
             OpdsEntryBuilder.createChapterMetadataEntries(
-                chapter = chapterMetadata,
-                manga = mangaDetails,
                 baseUrl = baseUrl,
                 locale = locale,
+                chapter = chapterMetadata,
+                manga = mangaDetails,
             )
 
         builder.entries.add(primaryEntry)
@@ -751,19 +794,25 @@ object OpdsFeedBuilder {
     /**
      * Builds a simple OPDS feed to indicate that a resource was not found.
      * @param baseUrl The base URL.
+     * @param locale The locale for localization.
      * @param idPath The path that was not found.
      * @param title The title for the feed (e.g., an error message).
-     * @param locale The locale for localization.
      * @return An XML string representing the 'not found' feed.
      */
     fun buildNotFoundFeed(
         baseUrl: String,
+        locale: Locale,
         idPath: String,
         title: String,
-        locale: Locale,
     ): String =
-        FeedBuilderInternal(baseUrl, idPath, title, locale, feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION, pageNum = null)
-            .apply { totalResults = 0L }
+        FeedBuilderInternal(
+            baseUrl = baseUrl,
+            locale = locale,
+            idPath = idPath,
+            title = title,
+            feedType = OpdsConstants.TYPE_ATOM_XML_FEED_ACQUISITION,
+            pageNum = null,
+        ).apply { totalResults = 0L }
             .build()
             .let(OpdsXmlUtil::serializeFeedToString)
 }

server/src/main/kotlin/suwayomi/tachidesk/opds/repository/ChapterRepository.kt

@@ -1,17 +1,29 @@
 package suwayomi.tachidesk.opds.repository
 
+import io.github.oshai.kotlinlogging.KotlinLogging
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.awaitAll
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.withContext
 import org.jetbrains.exposed.v1.core.Column
 import org.jetbrains.exposed.v1.core.JoinType
 import org.jetbrains.exposed.v1.core.Op
 import org.jetbrains.exposed.v1.core.ResultRow
 import org.jetbrains.exposed.v1.core.SortOrder
 import org.jetbrains.exposed.v1.core.and
+import org.jetbrains.exposed.v1.core.count
 import org.jetbrains.exposed.v1.core.eq
 import org.jetbrains.exposed.v1.core.greater
+import org.jetbrains.exposed.v1.core.inList
 import org.jetbrains.exposed.v1.jdbc.andWhere
 import org.jetbrains.exposed.v1.jdbc.select
 import org.jetbrains.exposed.v1.jdbc.transactions.transaction
+import org.jetbrains.exposed.v1.jdbc.update
+import suwayomi.tachidesk.manga.impl.ChapterDownloadHelper
 import suwayomi.tachidesk.manga.impl.chapter.getChapterDownloadReady
+import suwayomi.tachidesk.manga.impl.chapter.refreshChapterPageList
+import suwayomi.tachidesk.manga.impl.chapter.updateChapterPersistence
 import suwayomi.tachidesk.manga.model.table.ChapterTable
 import suwayomi.tachidesk.manga.model.table.MangaTable
 import suwayomi.tachidesk.manga.model.table.SourceTable
@@ -24,6 +36,7 @@ import suwayomi.tachidesk.server.serverConfig
 object ChapterRepository {
     private val opdsItemsPerPageBounded: Int
         get() = serverConfig.opdsItemsPerPage.value
+    private val logger = KotlinLogging.logger {}
 
     private fun ResultRow.toOpdsChapterListAcqEntry(): OpdsChapterListAcqEntry =
         OpdsChapterListAcqEntry(
@@ -38,69 +51,165 @@ object ChapterRepository {
             lastReadAt = this[ChapterTable.lastReadAt],
             sourceOrder = this[ChapterTable.sourceOrder],
             pageCount = this[ChapterTable.pageCount],
+            downloaded = this[ChapterTable.isDownloaded],
         )
 
-    fun getChaptersForManga(
+    suspend fun getChaptersForManga(
         mangaId: Int,
-        pageNum: Int,
         sortColumn: Column<*>,
         sortOrder: SortOrder,
         filter: String,
-    ): Pair<List<OpdsChapterListAcqEntry>, Long> =
-        transaction {
-            val conditions = mutableListOf<Op<Boolean>>()
-            conditions.add(ChapterTable.manga eq mangaId)
+        pageNum: Int,
+        skipMetadata: Boolean,
+    ): Pair<List<OpdsChapterListAcqEntry>, Long> {
+        val (rawChapters, totalCount) =
+            transaction {
+                val conditions = mutableListOf<Op<Boolean>>()
+                conditions.add(ChapterTable.manga eq mangaId)
 
-            when (filter) {
-                "unread" -> conditions.add(ChapterTable.isRead eq false)
-                "read" -> conditions.add(ChapterTable.isRead eq true)
-            }
-            if (serverConfig.opdsShowOnlyDownloadedChapters.value) {
-                conditions.add(ChapterTable.isDownloaded eq true)
+                when (filter) {
+                    "unread" -> conditions.add(ChapterTable.isRead eq false)
+                    "read" -> conditions.add(ChapterTable.isRead eq true)
+                }
+                if (serverConfig.opdsShowOnlyDownloadedChapters.value) {
+                    conditions.add(ChapterTable.isDownloaded eq true)
+                }
+
+                val finalCondition = conditions.reduceOrNull { acc, op -> acc and op } ?: Op.TRUE
+
+                val baseQuery =
+                    ChapterTable
+                        .select(ChapterTable.columns)
+                        .where(finalCondition)
+
+                val totalCount = baseQuery.count()
+
+                val chapters =
+                    baseQuery
+                        .orderBy(sortColumn to sortOrder)
+                        .limit(opdsItemsPerPageBounded)
+                        .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
+                        .map { it.toOpdsChapterListAcqEntry() }
+
+                Pair(chapters, totalCount)
             }
 
-            val finalCondition = conditions.reduceOrNull { acc, op -> acc and op } ?: Op.TRUE
-
-            val baseQuery =
-                ChapterTable
-                    .select(ChapterTable.columns)
-                    .where(finalCondition)
-
-            val totalCount = baseQuery.count()
-
-            val chapters =
-                baseQuery
-                    .orderBy(sortColumn to sortOrder)
-                    .limit(opdsItemsPerPageBounded)
-                    .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
-                    .map { it.toOpdsChapterListAcqEntry() }
-
-            Pair(chapters, totalCount)
+        // If not skipping metadata, return basic DTOs
+        if (!skipMetadata) {
+            return Pair(rawChapters, totalCount)
         }
 
+        // If skipping metadata, enrich DTOs with page count and file size
+        val enrichedChapters =
+            coroutineScope {
+                rawChapters.map { entry ->
+                    async(Dispatchers.IO) {
+                        var pageCount = entry.pageCount
+                        var isDownloaded = entry.downloaded
+
+                        // Verify physical files if page count is unknown or the DB marks it as downloaded
+                        if (pageCount <= 0 || isDownloaded) {
+                            val physicalPageCount =
+                                runCatching {
+                                    ChapterDownloadHelper.getImageCount(entry.mangaId, entry.id)
+                                }.getOrDefault(0)
+
+                            if (physicalPageCount > 0) {
+                                // Files exist! Sync DB if needed
+                                if (updateChapterPersistence(
+                                        chapterId = entry.id,
+                                        isMarkedAsDownloaded = isDownloaded,
+                                        dbPageCount = pageCount,
+                                        downloadPageCount = physicalPageCount,
+                                        lastPageRead = entry.lastPageRead,
+                                        logger = logger,
+                                    )
+                                ) {
+                                    pageCount = physicalPageCount
+                                    isDownloaded = true
+                                }
+                            } else {
+                                if (isDownloaded) {
+                                    // Fix DB state if marked as downloaded but physical files are missing
+                                    transaction {
+                                        ChapterTable.update({ ChapterTable.id eq entry.id }) {
+                                            it[ChapterTable.isDownloaded] = false
+                                        }
+                                    }
+                                    isDownloaded = false
+                                }
+
+                                if (pageCount <= 0) {
+                                    // No files, and DB has no page count. Fetch from network
+                                    pageCount =
+                                        runCatching {
+                                            refreshChapterPageList(entry.mangaId, entry.id)
+                                        }.onFailure {
+                                            logger.warn(it) { "Failed to fetch page count for chapter ${entry.id}" }
+                                        }.getOrDefault(0)
+                                }
+                            }
+                        }
+
+                        // Calculate CBZ size if downloaded
+                        val cbzFileSize =
+                            if (isDownloaded) {
+                                runCatching {
+                                    ChapterDownloadHelper.getChapterArchiveSize(entry.mangaId, entry.id)
+                                }.getOrNull()
+                            } else {
+                                null
+                            }
+
+                        entry.copy(
+                            pageCount = pageCount,
+                            downloaded = isDownloaded,
+                            cbzFileSize = cbzFileSize,
+                        )
+                    }
+                }
+            }.awaitAll()
+                // Exclude unreachable chapters that are not downloaded and have no page count
+                .filter { it.downloaded || it.pageCount > 0 }
+
+        return Pair(enrichedChapters, totalCount)
+    }
+
     suspend fun getChapterDetailsForMetadataFeed(
         mangaId: Int,
         chapterSourceOrder: Int,
-    ): OpdsChapterMetadataAcqEntry? =
-        try {
-            val chapterDataClass = getChapterDownloadReady(chapterIndex = chapterSourceOrder, mangaId = mangaId)
-            OpdsChapterMetadataAcqEntry(
-                id = chapterDataClass.id,
-                mangaId = chapterDataClass.mangaId,
-                name = chapterDataClass.name,
-                uploadDate = chapterDataClass.uploadDate,
-                scanlator = chapterDataClass.scanlator,
-                read = chapterDataClass.read,
-                lastPageRead = chapterDataClass.lastPageRead,
-                lastReadAt = chapterDataClass.lastReadAt,
-                sourceOrder = chapterDataClass.index,
-                downloaded = chapterDataClass.downloaded,
-                pageCount = chapterDataClass.pageCount,
-                url = chapterDataClass.realUrl,
-            )
-        } catch (e: Exception) {
-            null
-        }
+    ): OpdsChapterMetadataAcqEntry? {
+        val chapterDataClass =
+            try {
+                getChapterDownloadReady(chapterIndex = chapterSourceOrder, mangaId = mangaId)
+            } catch (e: Exception) {
+                return null
+            }
+
+        return OpdsChapterMetadataAcqEntry(
+            id = chapterDataClass.id,
+            mangaId = chapterDataClass.mangaId,
+            name = chapterDataClass.name,
+            uploadDate = chapterDataClass.uploadDate,
+            chapterNumber = chapterDataClass.chapterNumber,
+            scanlator = chapterDataClass.scanlator,
+            read = chapterDataClass.read,
+            lastPageRead = chapterDataClass.lastPageRead,
+            lastReadAt = chapterDataClass.lastReadAt,
+            sourceOrder = chapterDataClass.index,
+            downloaded = chapterDataClass.downloaded,
+            pageCount = chapterDataClass.pageCount,
+            url = chapterDataClass.realUrl,
+            cbzFileSize =
+                if (chapterDataClass.downloaded) {
+                    withContext(Dispatchers.IO) {
+                        runCatching { ChapterDownloadHelper.getChapterArchiveSize(mangaId, chapterDataClass.id) }.getOrNull()
+                    }
+                } else {
+                    null
+                },
+        )
+    }
 
     fun getLibraryUpdates(pageNum: Int): Pair<List<OpdsLibraryUpdateAcqEntry>, Long> =
         transaction {
@@ -115,21 +224,38 @@ object ChapterRepository {
 
             val totalCount = query.count()
 
-            val items =
+            val rawItems =
                 query
                     .orderBy(ChapterTable.fetchedAt to SortOrder.DESC, ChapterTable.sourceOrder to SortOrder.DESC)
                     .limit(opdsItemsPerPageBounded)
                     .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
-                    .map {
-                        OpdsLibraryUpdateAcqEntry(
-                            chapter = it.toOpdsChapterListAcqEntry(),
-                            mangaTitle = it[MangaTable.title],
-                            mangaAuthor = it[MangaTable.author],
-                            mangaId = it[MangaTable.id].value,
-                            mangaSourceLang = it[SourceTable.lang],
-                            mangaThumbnailUrl = it[MangaTable.thumbnail_url],
-                        )
-                    }
+                    .toList()
+
+            val mangaIds = rawItems.map { it[MangaTable.id].value }.distinct()
+            val chapterCounts =
+                if (mangaIds.isNotEmpty()) {
+                    ChapterTable
+                        .select(ChapterTable.manga, ChapterTable.id.count())
+                        .where { ChapterTable.manga inList mangaIds }
+                        .groupBy(ChapterTable.manga)
+                        .associate { it[ChapterTable.manga].value to it[ChapterTable.id.count()] }
+                } else {
+                    emptyMap()
+                }
+
+            val items =
+                rawItems.map {
+                    val mId = it[MangaTable.id].value
+                    OpdsLibraryUpdateAcqEntry(
+                        chapter = it.toOpdsChapterListAcqEntry(),
+                        mangaTitle = it[MangaTable.title],
+                        mangaAuthor = it[MangaTable.author],
+                        mangaId = mId,
+                        mangaSourceLang = it[SourceTable.lang],
+                        mangaThumbnailUrl = it[MangaTable.thumbnail_url],
+                        mangaTotalChapters = chapterCounts[mId] ?: 0L,
+                    )
+                }
             Pair(items, totalCount)
         }
 
@@ -146,21 +272,38 @@ object ChapterRepository {
 
             val totalCount = query.count()
 
-            val items =
+            val rawItems =
                 query
                     .orderBy(ChapterTable.lastReadAt to SortOrder.DESC)
                     .limit(opdsItemsPerPageBounded)
                     .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
-                    .map {
-                        OpdsHistoryAcqEntry(
-                            chapter = it.toOpdsChapterListAcqEntry(),
-                            mangaTitle = it[MangaTable.title],
-                            mangaAuthor = it[MangaTable.author],
-                            mangaId = it[MangaTable.id].value,
-                            mangaSourceLang = it[SourceTable.lang],
-                            mangaThumbnailUrl = it[MangaTable.thumbnail_url],
-                        )
-                    }
+                    .toList()
+
+            val mangaIds = rawItems.map { it[MangaTable.id].value }.distinct()
+            val chapterCounts =
+                if (mangaIds.isNotEmpty()) {
+                    ChapterTable
+                        .select(ChapterTable.manga, ChapterTable.id.count())
+                        .where { ChapterTable.manga inList mangaIds }
+                        .groupBy(ChapterTable.manga)
+                        .associate { it[ChapterTable.manga].value to it[ChapterTable.id.count()] }
+                } else {
+                    emptyMap()
+                }
+
+            val items =
+                rawItems.map {
+                    val mId = it[MangaTable.id].value
+                    OpdsHistoryAcqEntry(
+                        chapter = it.toOpdsChapterListAcqEntry(),
+                        mangaTitle = it[MangaTable.title],
+                        mangaAuthor = it[MangaTable.author],
+                        mangaId = mId,
+                        mangaSourceLang = it[SourceTable.lang],
+                        mangaThumbnailUrl = it[MangaTable.thumbnail_url],
+                        mangaTotalChapters = chapterCounts[mId] ?: 0L,
+                    )
+                }
             Pair(items, totalCount)
         }
 

server/src/main/kotlin/suwayomi/tachidesk/opds/repository/MangaRepository.kt

@@ -11,6 +11,7 @@ import org.jetbrains.exposed.v1.core.and
 import org.jetbrains.exposed.v1.core.eq
 import org.jetbrains.exposed.v1.core.greater
 import org.jetbrains.exposed.v1.core.inList
+import org.jetbrains.exposed.v1.core.inSubQuery
 import org.jetbrains.exposed.v1.core.intLiteral
 import org.jetbrains.exposed.v1.core.like
 import org.jetbrains.exposed.v1.core.lowerCase
@@ -36,8 +37,72 @@ import suwayomi.tachidesk.opds.dto.OpdsMangaDetails
 import suwayomi.tachidesk.opds.dto.OpdsMangaFilter
 import suwayomi.tachidesk.opds.dto.OpdsSearchCriteria
 import suwayomi.tachidesk.opds.dto.PrimaryFilterType
+import suwayomi.tachidesk.opds.util.OpdsStringUtil.formatSourceName
 import suwayomi.tachidesk.server.serverConfig
 
+/**
+ * Applies dynamic filters based on the current user configuration and cross-filters.
+ * Allows excluding a specific field to calculate mutual exclusion facet counts efficiently.
+ *
+ * @param criteria The filtering criteria.
+ * @param excludeField The field to exclude from filtering.
+ */
+fun Query.applyOpdsMangaFilter(
+    criteria: OpdsMangaFilter,
+    excludeField: String? = null,
+) {
+    if (excludeField != "source_id") {
+        criteria.sourceId?.let { andWhere { MangaTable.sourceReference eq it } }
+    }
+    if (excludeField != "category_id") {
+        criteria.categoryId?.let { andWhere { CategoryMangaTable.category eq it } }
+    }
+    if (excludeField != "status_id") {
+        criteria.statusId?.let { andWhere { MangaTable.status eq it } }
+    }
+    if (excludeField != "lang_code") {
+        criteria.langCode?.let { andWhere { SourceTable.lang eq it } }
+    }
+    if (excludeField != "genre") {
+        criteria.genre?.let { genre ->
+            val genreTrimmed = genre.trim()
+            andWhere {
+                (MangaTable.genre like "%, $genreTrimmed, %") or
+                    (MangaTable.genre like "$genreTrimmed, %") or
+                    (MangaTable.genre like "%, $genreTrimmed") or
+                    (MangaTable.genre eq genreTrimmed)
+            }
+        }
+    }
+    if (excludeField != "filter") {
+        criteria.filter?.let { filterVal ->
+            when (filterVal) {
+                "unread" -> {
+                    andWhere {
+                        MangaTable.id inSubQuery
+                            ChapterTable.select(ChapterTable.manga).where { ChapterTable.isRead eq false }
+                    }
+                }
+
+                "downloaded" -> {
+                    andWhere {
+                        MangaTable.id inSubQuery
+                            ChapterTable.select(ChapterTable.manga).where { ChapterTable.isDownloaded eq true }
+                    }
+                }
+
+                "ongoing" -> {
+                    andWhere { MangaTable.status eq MangaStatus.ONGOING.value }
+                }
+
+                "completed" -> {
+                    andWhere { MangaTable.status eq MangaStatus.COMPLETED.value }
+                }
+            }
+        }
+    }
+}
+
 /**
  * Repository for fetching manga data tailored for OPDS feeds.
  */
@@ -60,53 +125,48 @@ object MangaRepository {
             sourceLang = this[SourceTable.lang],
             inLibrary = this[MangaTable.inLibrary],
             status = this[MangaTable.status],
-            sourceName = this[SourceTable.name],
+            sourceName = formatSourceName(this[SourceTable.name], this[SourceTable.lang]),
             lastFetchedAt = this[MangaTable.lastFetchedAt],
             url = this[MangaTable.realUrl],
         )
 
     /**
      * Centralized function to retrieve paginated, sorted, and filtered manga from the library.
+     * @param criteria Additional filtering criteria for categories, sources, etc.
      * @param pageNum The page number for pagination.
      * @param sort The sorting parameter.
      * @param filter The filtering parameter.
-     * @param criteria Additional filtering criteria for categories, sources, etc.
      * @return An [OpdsLibraryFeedResult] containing the list of manga, total count, and the specific filter name.
      */
     fun getLibraryManga(
+        criteria: OpdsMangaFilter,
         pageNum: Int,
         sort: String?,
         filter: String?,
-        criteria: OpdsMangaFilter,
     ): OpdsLibraryFeedResult =
         transaction {
             val unreadCountExpr = Case().When(ChapterTable.isRead eq false, intLiteral(1)).Else(intLiteral(0)).sum()
             val unreadCount = unreadCountExpr.alias("unread_count")
 
             // Base query with necessary joins for filtering and sorting
-            val query =
+            var baseJoin =
                 MangaTable
                     .join(SourceTable, JoinType.INNER, MangaTable.sourceReference, SourceTable.id)
                     .join(ChapterTable, JoinType.LEFT, MangaTable.id, ChapterTable.manga)
-                    .join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+
+            if (criteria.categoryId != null) {
+                baseJoin = baseJoin.join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+            }
+
+            val query =
+                baseJoin
                     .select(MangaTable.columns + SourceTable.lang + SourceTable.name + unreadCount)
                     .where { MangaTable.inLibrary eq true }
-                    .groupBy(MangaTable.id, SourceTable.lang, SourceTable.name)
 
-            // Apply specific filters from criteria
-            criteria.sourceId?.let { query.andWhere { MangaTable.sourceReference eq it } }
-            criteria.categoryId?.let { query.andWhere { CategoryMangaTable.category eq it } }
-            criteria.statusId?.let { query.andWhere { MangaTable.status eq it } }
-            criteria.langCode?.let { query.andWhere { SourceTable.lang eq it } }
-            criteria.genre?.let { genre ->
-                val genreTrimmed = genre.trim()
-                val genreCondition =
-                    (MangaTable.genre like "%, $genreTrimmed, %") or
-                        (MangaTable.genre like "$genreTrimmed, %") or
-                        (MangaTable.genre like "%, $genreTrimmed") or
-                        (MangaTable.genre eq genreTrimmed)
-                query.andWhere { genreCondition }
-            }
+            query.applyOpdsMangaFilter(criteria)
+            applyMangaLibrarySort(query, sort)
+
+            query.groupBy(MangaTable.id, SourceTable.lang, SourceTable.name)
 
             // Efficiently get the name of the primary filter item
             val specificFilterName =
@@ -114,10 +174,10 @@ object MangaRepository {
                     PrimaryFilterType.SOURCE -> {
                         criteria.sourceId?.let {
                             SourceTable
-                                .select(SourceTable.name)
+                                .select(SourceTable.name, SourceTable.lang)
                                 .where { SourceTable.id eq it }
                                 .firstOrNull()
-                                ?.get(SourceTable.name)
+                                ?.let { formatSourceName(it[SourceTable.name], it[SourceTable.lang]) }
                         }
                     }
 
@@ -150,8 +210,6 @@ object MangaRepository {
                     }
                 }
 
-            applyMangaLibrarySortAndFilter(query, sort, filter)
-
             val totalCount = query.count()
             val mangas =
                 query
@@ -245,6 +303,7 @@ object MangaRepository {
      */
     fun getMangaDetails(mangaId: Int): OpdsMangaDetails? =
         transaction {
+            val chapterCount = ChapterTable.select(ChapterTable.id).where { ChapterTable.manga eq mangaId }.count()
             MangaTable
                 .select(MangaTable.id, MangaTable.title, MangaTable.thumbnail_url, MangaTable.author)
                 .where { MangaTable.id eq mangaId }
@@ -255,6 +314,7 @@ object MangaRepository {
                         title = it[MangaTable.title],
                         thumbnailUrl = it[MangaTable.thumbnail_url],
                         author = it[MangaTable.author],
+                        totalChapters = chapterCount,
                     )
                 }
         }
@@ -263,26 +323,15 @@ object MangaRepository {
      * Applies sorting and filtering logic to a manga library query.
      * @param query The Exposed SQL query to modify.
      * @param sort The sorting parameter.
-     * @param filter The filtering parameter.
      */
-    private fun applyMangaLibrarySortAndFilter(
+    private fun applyMangaLibrarySort(
         query: Query,
         sort: String?,
-        filter: String?,
     ) {
         val unreadCountExpr = Case().When(ChapterTable.isRead eq false, intLiteral(1)).Else(intLiteral(0)).sum()
-        val downloadedCountExpr = Case().When(ChapterTable.isDownloaded eq true, intLiteral(1)).Else(intLiteral(0)).sum()
         val lastReadAtExpr = ChapterTable.lastReadAt.max()
         val latestChapterDateExpr = ChapterTable.date_upload.max()
 
-        // Apply filtering using HAVING for aggregate functions or WHERE for direct columns
-        when (filter) {
-            "unread" -> query.having { unreadCountExpr greater 0 }
-            "downloaded" -> query.having { downloadedCountExpr greater 0 }
-            "ongoing" -> query.andWhere { MangaTable.status eq MangaStatus.ONGOING.value }
-            "completed" -> query.andWhere { MangaTable.status eq MangaStatus.COMPLETED.value }
-        }
-
         // Apply sorting
         when (sort) {
             "alpha_asc" -> query.orderBy(MangaTable.title to SortOrder.ASC)
@@ -296,27 +345,44 @@ object MangaRepository {
     }
 
     /**
-     * Calculates the count of manga for various library filter facets.
+     * Calculates the count of manga for various library filter facets, respecting other active cross-filters.
+     * @param activeFilters The currently active filters to respect during count calculation.
      * @return A map where keys are filter names and values are the counts.
      */
-    fun getLibraryFilterCounts(): Map<String, Long> =
+    fun getLibraryFilterCounts(activeFilters: OpdsMangaFilter): Map<String, Long> =
         transaction {
-            val unreadCountExpr = Case().When(ChapterTable.isRead eq false, intLiteral(1)).Else(intLiteral(0)).sum()
-            val downloadedCountExpr = Case().When(ChapterTable.isDownloaded eq true, intLiteral(1)).Else(intLiteral(0)).sum()
+            var baseJoin =
+                MangaTable
+                    .join(SourceTable, JoinType.INNER, MangaTable.sourceReference, SourceTable.id)
+
+            if (activeFilters.categoryId != null) {
+                baseJoin = baseJoin.join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+            }
 
             val baseQuery =
-                MangaTable
-                    .join(ChapterTable, JoinType.LEFT, MangaTable.id, ChapterTable.manga)
+                baseJoin
                     .select(MangaTable.id)
                     .where { MangaTable.inLibrary eq true }
-                    .groupBy(MangaTable.id)
+                    .withDistinct()
 
-            val unreadCount = baseQuery.copy().having { unreadCountExpr greater 0 }.count()
-            val downloadedCount = baseQuery.copy().having { downloadedCountExpr greater 0 }.count()
+            baseQuery.applyOpdsMangaFilter(activeFilters, excludeField = "filter")
 
-            val statusBaseQuery = MangaTable.select(MangaTable.id).where { MangaTable.inLibrary eq true }
-            val ongoingCount = statusBaseQuery.copy().andWhere { MangaTable.status eq MangaStatus.ONGOING.value }.count()
-            val completedCount = statusBaseQuery.copy().andWhere { MangaTable.status eq MangaStatus.COMPLETED.value }.count()
+            val unreadCount =
+                baseQuery
+                    .copy()
+                    .andWhere {
+                        MangaTable.id inSubQuery
+                            ChapterTable.select(ChapterTable.manga).where { ChapterTable.isRead eq false }
+                    }.count()
+            val downloadedCount =
+                baseQuery
+                    .copy()
+                    .andWhere {
+                        MangaTable.id inSubQuery
+                            ChapterTable.select(ChapterTable.manga).where { ChapterTable.isDownloaded eq true }
+                    }.count()
+            val ongoingCount = baseQuery.copy().andWhere { MangaTable.status eq MangaStatus.ONGOING.value }.count()
+            val completedCount = baseQuery.copy().andWhere { MangaTable.status eq MangaStatus.COMPLETED.value }.count()
 
             mapOf(
                 "unread" to unreadCount,

server/src/main/kotlin/suwayomi/tachidesk/opds/repository/NavigationRepository.kt

@@ -21,10 +21,12 @@ import suwayomi.tachidesk.opds.constants.OpdsConstants
 import suwayomi.tachidesk.opds.dto.OpdsCategoryNavEntry
 import suwayomi.tachidesk.opds.dto.OpdsGenreNavEntry
 import suwayomi.tachidesk.opds.dto.OpdsLanguageNavEntry
+import suwayomi.tachidesk.opds.dto.OpdsMangaFilter
 import suwayomi.tachidesk.opds.dto.OpdsRootNavEntry
 import suwayomi.tachidesk.opds.dto.OpdsSourceNavEntry
 import suwayomi.tachidesk.opds.dto.OpdsStatusNavEntry
 import suwayomi.tachidesk.opds.util.OpdsStringUtil.encodeForOpdsURL
+import suwayomi.tachidesk.opds.util.OpdsStringUtil.formatSourceName
 import suwayomi.tachidesk.server.serverConfig
 import java.util.Locale
 
@@ -131,15 +133,14 @@ object NavigationRepository {
             )
         }
 
-    // ... (El resto del archivo permanece sin cambios)
     fun getExploreSources(pageNum: Int): Pair<List<OpdsSourceNavEntry>, Long> =
         transaction {
             val query =
                 SourceTable
                     .join(ExtensionTable, JoinType.LEFT, onColumn = SourceTable.extension, otherColumn = ExtensionTable.id)
-                    .select(SourceTable.id, SourceTable.name, ExtensionTable.apkName)
+                    .select(SourceTable.id, SourceTable.name, SourceTable.lang, ExtensionTable.apkName)
                     .where { ExtensionTable.isInstalled eq true }
-                    .groupBy(SourceTable.id, SourceTable.name, ExtensionTable.apkName)
+                    .groupBy(SourceTable.id, SourceTable.name, SourceTable.lang, ExtensionTable.apkName)
                     .orderBy(SourceTable.name to SortOrder.ASC)
 
             val totalCount = query.count()
@@ -150,7 +151,7 @@ object NavigationRepository {
                     .map {
                         OpdsSourceNavEntry(
                             id = it[SourceTable.id].value,
-                            name = it[SourceTable.name],
+                            name = formatSourceName(it[SourceTable.name], it[SourceTable.lang]),
                             iconUrl = it[ExtensionTable.apkName].let { apkName -> Extension.getExtensionIconUrl(apkName) },
                             mangaCount = null,
                         )
@@ -158,36 +159,71 @@ object NavigationRepository {
             Pair(sources, totalCount)
         }
 
-    fun getLibrarySources(pageNum: Int): Pair<List<OpdsSourceNavEntry>, Long> =
+    fun getLibrarySources(
+        pageNum: Int? = null,
+        activeFilters: OpdsMangaFilter = OpdsMangaFilter(),
+    ): Pair<List<OpdsSourceNavEntry>, Long> =
         transaction {
             val mangaCount = MangaTable.id.countDistinct().alias("manga_count")
 
-            val query =
+            var baseJoin =
                 SourceTable
                     .join(MangaTable, JoinType.INNER, SourceTable.id, MangaTable.sourceReference)
                     .join(ExtensionTable, JoinType.LEFT, onColumn = SourceTable.extension, otherColumn = ExtensionTable.id)
-                    .select(SourceTable.id, SourceTable.name, ExtensionTable.apkName, mangaCount)
+
+            if (activeFilters.categoryId != null) {
+                baseJoin = baseJoin.join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+            }
+
+            val query =
+                baseJoin
+                    .select(SourceTable.id, SourceTable.name, SourceTable.lang, ExtensionTable.apkName, mangaCount)
                     .where { MangaTable.inLibrary eq true }
-                    .groupBy(SourceTable.id, SourceTable.name, ExtensionTable.apkName)
-                    .orderBy(SourceTable.name to SortOrder.ASC)
+
+            query.applyOpdsMangaFilter(activeFilters, excludeField = "source_id")
+
+            query
+                .groupBy(SourceTable.id, SourceTable.name, SourceTable.lang, ExtensionTable.apkName)
+                .orderBy(SourceTable.name to SortOrder.ASC)
 
             val totalCount = query.count()
-            val sources =
+
+            if (pageNum != null) {
                 query
                     .limit(opdsItemsPerPageBounded)
                     .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
-                    .map {
-                        OpdsSourceNavEntry(
-                            id = it[SourceTable.id].value,
-                            name = it[SourceTable.name],
-                            iconUrl = it[ExtensionTable.apkName].let { apkName -> Extension.getExtensionIconUrl(apkName) },
-                            mangaCount = it[mangaCount],
-                        )
-                    }
+            }
+
+            val sources =
+                query.map {
+                    OpdsSourceNavEntry(
+                        id = it[SourceTable.id].value,
+                        name = formatSourceName(it[SourceTable.name], it[SourceTable.lang]),
+                        iconUrl = it[ExtensionTable.apkName].let { apkName -> Extension.getExtensionIconUrl(apkName) },
+                        mangaCount = it[mangaCount],
+                    )
+                }
             Pair(sources, totalCount)
         }
 
-    fun getCategories(pageNum: Int): Pair<List<OpdsCategoryNavEntry>, Long> =
+    fun getSourceDetails(sourceId: Long): Pair<String, String?>? =
+        transaction {
+            SourceTable
+                .join(ExtensionTable, JoinType.LEFT, onColumn = SourceTable.extension, otherColumn = ExtensionTable.id)
+                .select(SourceTable.name, SourceTable.lang, ExtensionTable.apkName)
+                .where { SourceTable.id eq sourceId }
+                .firstOrNull()
+                ?.let {
+                    val name = formatSourceName(it[SourceTable.name], it[SourceTable.lang])
+                    val icon = Extension.getExtensionIconUrl(it[ExtensionTable.apkName])
+                    Pair(name, icon)
+                }
+        }
+
+    fun getCategories(
+        pageNum: Int? = null,
+        activeFilters: OpdsMangaFilter = OpdsMangaFilter(),
+    ): Pair<List<OpdsCategoryNavEntry>, Long> =
         transaction {
             val mangaCount = MangaTable.id.countDistinct().alias("manga_count")
 
@@ -195,35 +231,57 @@ object NavigationRepository {
                 CategoryTable
                     .join(CategoryMangaTable, JoinType.INNER, CategoryTable.id, CategoryMangaTable.category)
                     .join(MangaTable, JoinType.INNER, CategoryMangaTable.manga, MangaTable.id)
+                    .join(SourceTable, JoinType.INNER, MangaTable.sourceReference, SourceTable.id)
                     .select(CategoryTable.id, CategoryTable.name, mangaCount)
                     .where { MangaTable.inLibrary eq true }
-                    .groupBy(CategoryTable.id, CategoryTable.name)
-                    .orderBy(CategoryTable.order to SortOrder.ASC)
+
+            query.applyOpdsMangaFilter(activeFilters, excludeField = "category_id")
+
+            query
+                .groupBy(CategoryTable.id, CategoryTable.name)
+                .orderBy(CategoryTable.order to SortOrder.ASC)
 
             val totalCount = query.count()
-            val categories =
+
+            if (pageNum != null) {
                 query
                     .limit(opdsItemsPerPageBounded)
                     .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
-                    .map {
-                        OpdsCategoryNavEntry(
-                            id = it[CategoryTable.id].value,
-                            name = it[CategoryTable.name],
-                            mangaCount = it[mangaCount],
-                        )
-                    }
+            }
+
+            val categories =
+                query.map {
+                    OpdsCategoryNavEntry(
+                        id = it[CategoryTable.id].value,
+                        name = it[CategoryTable.name],
+                        mangaCount = it[mangaCount],
+                    )
+                }
             Pair(categories, totalCount)
         }
 
     fun getGenres(
-        pageNum: Int,
         locale: Locale,
+        pageNum: Int? = null,
+        activeFilters: OpdsMangaFilter = OpdsMangaFilter(),
     ): Pair<List<OpdsGenreNavEntry>, Long> =
         transaction {
-            val allGenres =
+            var baseJoin =
                 MangaTable
+                    .join(SourceTable, JoinType.INNER, MangaTable.sourceReference, SourceTable.id)
+            if (activeFilters.categoryId != null) {
+                baseJoin = baseJoin.join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+            }
+
+            val query =
+                baseJoin
                     .select(MangaTable.genre)
                     .where { MangaTable.inLibrary eq true }
+
+            query.applyOpdsMangaFilter(activeFilters, excludeField = "genre")
+
+            val allGenres =
+                query
                     .mapNotNull { it[MangaTable.genre] }
                     .flatMap { it.split(",").map(String::trim).filterNot(String::isBlank) }
 
@@ -231,21 +289,32 @@ object NavigationRepository {
             val distinctGenres = genreCounts.keys.sorted()
 
             val totalCount = distinctGenres.size.toLong()
-            val fromIndex = ((pageNum - 1) * opdsItemsPerPageBounded)
-            val toIndex = minOf(fromIndex + opdsItemsPerPageBounded, distinctGenres.size)
+
+            val finalGenres =
+                if (pageNum != null) {
+                    val fromIndex = ((pageNum - 1) * opdsItemsPerPageBounded)
+                    val toIndex = minOf(fromIndex + opdsItemsPerPageBounded, distinctGenres.size)
+                    if (fromIndex < distinctGenres.size) distinctGenres.subList(fromIndex, toIndex) else emptyList()
+                } else {
+                    distinctGenres
+                }
+
             val paginatedGenres =
-                (if (fromIndex < distinctGenres.size) distinctGenres.subList(fromIndex, toIndex) else emptyList())
-                    .map { genreName ->
-                        OpdsGenreNavEntry(
-                            id = genreName.encodeForOpdsURL(),
-                            title = genreName,
-                            mangaCount = genreCounts[genreName]?.toLong() ?: 0L,
-                        )
-                    }
+                finalGenres.map { genreName ->
+                    OpdsGenreNavEntry(
+                        id = genreName.encodeForOpdsURL(),
+                        title = genreName,
+                        mangaCount = genreCounts[genreName]?.toLong() ?: 0L,
+                    )
+                }
             Pair(paginatedGenres, totalCount)
         }
 
-    fun getStatuses(locale: Locale): List<OpdsStatusNavEntry> {
+    fun getStatuses(
+        locale: Locale,
+        pageNum: Int? = null,
+        activeFilters: OpdsMangaFilter = OpdsMangaFilter(),
+    ): Pair<List<OpdsStatusNavEntry>, Long> {
         val statusStringResources: Map<MangaStatus, StringResource> =
             mapOf(
                 MangaStatus.UNKNOWN to MR.strings.manga_status_unknown,
@@ -259,43 +328,98 @@ object NavigationRepository {
 
         val statusCounts =
             transaction {
-                MangaTable
-                    .select(MangaTable.status, MangaTable.id.count())
-                    .where { MangaTable.inLibrary eq true }
+                val countExpr = MangaTable.id.countDistinct().alias("manga_count")
+
+                var baseJoin =
+                    MangaTable
+                        .join(SourceTable, JoinType.INNER, MangaTable.sourceReference, SourceTable.id)
+                if (activeFilters.categoryId != null) {
+                    baseJoin = baseJoin.join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+                }
+
+                val query =
+                    baseJoin
+                        .select(MangaTable.status, countExpr)
+                        .where { MangaTable.inLibrary eq true }
+
+                query.applyOpdsMangaFilter(activeFilters, excludeField = "status_id")
+
+                query
                     .groupBy(MangaTable.status)
-                    .associate { it[MangaTable.status] to it[MangaTable.id.count()] }
+                    .associate { it[MangaTable.status] to it[countExpr] }
             }
 
-        return MangaStatus.entries
-            .map { mangaStatus ->
-                val titleRes = statusStringResources[mangaStatus] ?: MR.strings.manga_status_unknown
-                OpdsStatusNavEntry(
-                    id = mangaStatus.value,
-                    title = titleRes.localized(locale),
-                    mangaCount = statusCounts[mangaStatus.value] ?: 0L,
-                )
-            }.sortedBy { it.id }
+        val allStatuses =
+            MangaStatus.entries
+                .map { mangaStatus ->
+                    val titleRes = statusStringResources[mangaStatus] ?: MR.strings.manga_status_unknown
+                    OpdsStatusNavEntry(
+                        id = mangaStatus.value,
+                        title = titleRes.localized(locale),
+                        mangaCount = statusCounts[mangaStatus.value] ?: 0L,
+                    )
+                }.sortedBy { it.id }
+
+        val totalCount = allStatuses.size.toLong()
+
+        val paginatedStatuses =
+            if (pageNum != null) {
+                val fromIndex = ((pageNum - 1) * opdsItemsPerPageBounded)
+                val toIndex = minOf(fromIndex + opdsItemsPerPageBounded, allStatuses.size)
+                if (fromIndex < allStatuses.size) allStatuses.subList(fromIndex, toIndex) else emptyList()
+            } else {
+                allStatuses
+            }
+
+        return Pair(paginatedStatuses, totalCount)
     }
 
-    fun getContentLanguages(uiLocale: Locale): List<OpdsLanguageNavEntry> =
+    fun getContentLanguages(
+        locale: Locale,
+        pageNum: Int? = null,
+        activeFilters: OpdsMangaFilter = OpdsMangaFilter(),
+    ): Pair<List<OpdsLanguageNavEntry>, Long> =
         transaction {
             val mangaCount = MangaTable.id.countDistinct().alias("manga_count")
-            SourceTable
-                .join(MangaTable, JoinType.INNER, SourceTable.id, MangaTable.sourceReference)
-                .select(SourceTable.lang, mangaCount)
-                .where { MangaTable.inLibrary eq true }
+
+            var baseJoin =
+                SourceTable
+                    .join(MangaTable, JoinType.INNER, SourceTable.id, MangaTable.sourceReference)
+            if (activeFilters.categoryId != null) {
+                baseJoin = baseJoin.join(CategoryMangaTable, JoinType.LEFT, MangaTable.id, CategoryMangaTable.manga)
+            }
+
+            val query =
+                baseJoin
+                    .select(SourceTable.lang, mangaCount)
+                    .where { MangaTable.inLibrary eq true }
+
+            query.applyOpdsMangaFilter(activeFilters, excludeField = "lang_code")
+
+            query
                 .groupBy(SourceTable.lang)
                 .orderBy(SourceTable.lang to SortOrder.ASC)
-                .map {
+
+            val totalCount = query.count()
+
+            if (pageNum != null) {
+                query
+                    .limit(opdsItemsPerPageBounded)
+                    .offset(((pageNum - 1) * opdsItemsPerPageBounded).toLong())
+            }
+
+            val languages =
+                query.map {
                     val langCode = it[SourceTable.lang]
                     OpdsLanguageNavEntry(
                         id = langCode,
                         title =
-                            Locale.forLanguageTag(langCode).getDisplayName(uiLocale).replaceFirstChar { char ->
-                                if (char.isLowerCase()) char.titlecase(uiLocale) else char.toString()
+                            Locale.forLanguageTag(langCode).getDisplayName(locale).replaceFirstChar { char ->
+                                if (char.isLowerCase()) char.titlecase(locale) else char.toString()
                             },
                         mangaCount = it[mangaCount],
                     )
                 }
+            Pair(languages, totalCount)
         }
 }

server/src/main/kotlin/suwayomi/tachidesk/opds/util/OpdsStringUtil.kt

@@ -33,6 +33,19 @@ object OpdsStringUtil {
         return slug
     }
 
+    /**
+     * Formats the source name appending the language code if applicable.
+     */
+    fun formatSourceName(
+        name: String,
+        lang: String?,
+    ): String =
+        if (lang.isNullOrBlank() || lang == "all") {
+            name
+        } else {
+            "$name (${lang.uppercase()})"
+        }
+
     /**
      * Formats a size in bytes to a human-readable representation.
      * Uses binary (KiB, MiB, GiB, TiB) or decimal (KB, MB, GB, TB) units based on server configuration.

server/src/main/kotlin/suwayomi/tachidesk/server/ServerSetup.kt

@@ -36,6 +36,7 @@ import org.koin.core.context.startKoin
 import org.koin.core.module.Module
 import org.koin.dsl.module
 import suwayomi.tachidesk.global.impl.KcefWebView.Companion.toCefCookie
+import suwayomi.tachidesk.global.impl.sync.SyncManager
 import suwayomi.tachidesk.graphql.types.DatabaseType
 import suwayomi.tachidesk.i18n.LocalizationHelper
 import suwayomi.tachidesk.manga.impl.backup.proto.ProtoBackupExport
@@ -70,11 +71,6 @@ import java.net.Authenticator
 import java.net.PasswordAuthentication
 import java.security.Security
 import java.util.Locale
-import kotlin.concurrent.thread
-import kotlin.io.path.Path
-import kotlin.io.path.createDirectories
-import kotlin.io.path.div
-import kotlin.math.roundToInt
 
 private val logger = KotlinLogging.logger {}
 
@@ -517,6 +513,8 @@ fun applicationSetup() {
     // start DownloadManager and restore + resume downloads
     DownloadManager.restoreAndResumeDownloads()
 
+    SyncManager.scheduleSyncTask()
+
     // asynchronously initialize CEF
     GlobalScope.launch {
         CEFManager.init()

server/src/main/kotlin/suwayomi/tachidesk/server/database/migration/M0056_SyncYomi.kt

@@ -0,0 +1,224 @@
+package suwayomi.tachidesk.server.database.migration
+
+import de.neonew.exposed.migrations.helpers.SQLMigration
+import suwayomi.tachidesk.graphql.types.DatabaseType
+import suwayomi.tachidesk.server.serverConfig
+
+@Suppress("ClassName", "unused")
+class M0056_SyncYomi : SQLMigration() {
+    override val sql =
+        when (serverConfig.databaseType.value) {
+            DatabaseType.POSTGRESQL -> postgresQuery()
+            DatabaseType.H2 -> h2Query()
+        }
+
+    // language=postgresql
+    fun postgresQuery(): String =
+        """
+        ALTER TABLE manga ADD COLUMN version BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE manga ADD COLUMN is_syncing BOOLEAN NOT NULL DEFAULT FALSE;
+        ALTER TABLE manga ADD COLUMN last_modified_at BIGINT NOT NULL DEFAULT 0;
+
+        ALTER TABLE chapter ADD COLUMN version BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE chapter ADD COLUMN is_syncing BOOLEAN NOT NULL DEFAULT FALSE;
+        ALTER TABLE chapter ADD COLUMN last_modified_at BIGINT NOT NULL DEFAULT 0;
+
+        ALTER TABLE category ADD COLUMN version BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE category ADD COLUMN uid BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE category ADD COLUMN is_syncing BOOLEAN NOT NULL DEFAULT FALSE;
+        ALTER TABLE category ADD COLUMN last_modified_at BIGINT NOT NULL DEFAULT 0;
+
+
+        CREATE OR REPLACE FUNCTION update_manga_version()
+        RETURNS trigger AS $$
+        BEGIN
+            IF NOT NEW.is_syncing
+               AND ROW(NEW.url, NEW.description, NEW.in_library)
+                   IS DISTINCT FROM
+                   ROW(OLD.url, OLD.description, OLD.in_library)
+            THEN
+                NEW.version := OLD.version + 1;
+            END IF;
+
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+
+        CREATE TRIGGER update_manga_version
+        AFTER UPDATE ON manga
+        FOR EACH ROW
+        EXECUTE FUNCTION update_manga_version();
+
+
+        CREATE OR REPLACE FUNCTION update_chapter_and_manga_version()
+        RETURNS trigger AS $$
+        BEGIN
+            IF NOT NEW.is_syncing
+               AND ROW(NEW.read, NEW.bookmark, NEW.last_page_read)
+                   IS DISTINCT FROM
+                   ROW(OLD.read, OLD.bookmark, OLD.last_page_read)
+            THEN
+                NEW.version := OLD.version + 1;
+        
+                UPDATE manga SET version = version + 1 WHERE id = NEW.manga AND is_syncing = FALSE;
+            END IF;
+
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+
+        CREATE TRIGGER update_chapter_and_manga_version
+        AFTER UPDATE ON chapter
+        FOR EACH ROW
+        EXECUTE FUNCTION update_chapter_and_manga_version();
+
+
+        CREATE OR REPLACE FUNCTION update_manga_last_modified_at()
+        RETURNS trigger AS $$
+        BEGIN
+            NEW.last_modified_at := EXTRACT(EPOCH FROM NOW());
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+        
+        CREATE TRIGGER update_manga_last_modified_at
+        BEFORE UPDATE OR INSERT ON manga
+        FOR EACH ROW
+        EXECUTE FUNCTION update_manga_last_modified_at();
+        
+        
+        CREATE OR REPLACE FUNCTION update_chapter_last_modified_at()
+        RETURNS trigger AS $$
+        BEGIN
+            NEW.last_modified_at := EXTRACT(EPOCH FROM NOW());
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+        
+        CREATE TRIGGER update_chapter_last_modified_at
+        BEFORE UPDATE OR INSERT ON chapter
+        FOR EACH ROW
+        EXECUTE FUNCTION update_chapter_last_modified_at();
+
+
+        CREATE OR REPLACE FUNCTION insert_manga_category_update_version()
+        RETURNS trigger AS $$
+        BEGIN
+            UPDATE manga SET version = version + 1 WHERE id = NEW.manga AND is_syncing = FALSE;
+
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+
+        CREATE TRIGGER insert_manga_category_update_version
+        AFTER INSERT ON categorymanga
+        FOR EACH ROW
+        EXECUTE FUNCTION insert_manga_category_update_version();
+        
+
+        CREATE OR REPLACE FUNCTION insert_category_uid()
+        RETURNS trigger AS $$
+        BEGIN
+            IF NEW.uid = 0 THEN
+                NEW.uid := RANDOM(1, 9223372036854775807);
+            END IF;
+
+            IF NEW.last_modified_at = 0 THEN
+                NEW.last_modified_at := EXTRACT(EPOCH FROM NOW());
+            END IF;
+
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+        
+        CREATE TRIGGER insert_category_uid
+        BEFORE INSERT ON category
+        FOR EACH ROW
+        EXECUTE FUNCTION insert_category_uid();
+        
+        
+        CREATE OR REPLACE FUNCTION update_category_version()
+        RETURNS trigger AS $$
+        BEGIN
+            IF NOT NEW.is_syncing
+               AND ROW(NEW.name, NEW.sort_order)
+                   IS DISTINCT FROM
+                   ROW(OLD.name, OLD.sort_order)
+            THEN
+                NEW.version := NEW.version + 1;
+                NEW.last_modified_at := EXTRACT(EPOCH FROM NOW());
+            END IF;
+
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+        
+        CREATE TRIGGER update_category_version
+        BEFORE UPDATE ON category
+        FOR EACH ROW
+        EXECUTE FUNCTION update_category_version();
+        """.trimIndent()
+
+    // language=h2
+    fun h2Query() =
+        """
+        ALTER TABLE manga ADD COLUMN version BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE manga ADD COLUMN is_syncing BOOLEAN NOT NULL DEFAULT FALSE;
+        ALTER TABLE manga ADD COLUMN last_modified_at BIGINT NOT NULL DEFAULT 0;
+
+        ALTER TABLE chapter ADD COLUMN version BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE chapter ADD COLUMN is_syncing BOOLEAN NOT NULL DEFAULT FALSE;
+        ALTER TABLE chapter ADD COLUMN last_modified_at BIGINT NOT NULL DEFAULT 0;
+
+        ALTER TABLE category ADD COLUMN version BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE category ADD COLUMN uid BIGINT NOT NULL DEFAULT 0;
+        ALTER TABLE category ADD COLUMN is_syncing BOOLEAN NOT NULL DEFAULT FALSE;
+        ALTER TABLE category ADD COLUMN last_modified_at BIGINT NOT NULL DEFAULT 0;
+        
+
+        CREATE TRIGGER update_manga_version 
+        BEFORE UPDATE ON manga
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateMangaVersionTrigger";
+        
+        CREATE TRIGGER update_chapter_and_manga_version
+        BEFORE UPDATE ON chapter
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateChapterAndMangaVersionTrigger";
+        
+        CREATE TRIGGER update_manga_last_modified_at
+        BEFORE UPDATE ON manga
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateMangaLastModifiedAtTrigger";
+        
+        CREATE TRIGGER insert_manga_last_modified_at
+        BEFORE INSERT ON manga
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateMangaLastModifiedAtTrigger";
+        
+        CREATE TRIGGER update_chapter_last_modified_at
+        BEFORE UPDATE ON chapter
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateChapterLastModifiedAtTrigger";
+        
+        CREATE TRIGGER insert_chapter_last_modified_at
+        BEFORE INSERT ON chapter
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateChapterLastModifiedAtTrigger";
+        
+        CREATE TRIGGER insert_manga_category_update_version
+        AFTER INSERT ON categorymanga
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.InsertMangaCategoryUpdateVersionTrigger";
+        
+        CREATE TRIGGER insert_category_uid
+        BEFORE INSERT ON category
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.InsertCategoryUidTrigger";
+        
+        CREATE TRIGGER update_category_version
+        BEFORE UPDATE ON category
+        FOR EACH ROW
+        CALL "suwayomi.tachidesk.server.database.trigger.UpdateCategoryVersionTrigger";
+        """.trimIndent()
+}

server/src/main/kotlin/suwayomi/tachidesk/server/database/trigger/SyncYomiTriggers.kt

@@ -0,0 +1,141 @@
+package suwayomi.tachidesk.server.database.trigger
+
+import org.h2.tools.TriggerAdapter
+import java.sql.Connection
+import java.sql.ResultSet
+import kotlin.random.Random
+import kotlin.time.Clock
+
+@Suppress("unused")
+class UpdateMangaVersionTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet,
+        newRow: ResultSet,
+    ) {
+        val isSyncing = newRow.getBoolean("is_syncing")
+        val hasChanged =
+            oldRow.getString("url") != newRow.getString("url") ||
+                oldRow.getString("description") != newRow.getString("description") ||
+                oldRow.getBoolean("in_library") != newRow.getBoolean("in_library")
+
+        if (!isSyncing && hasChanged) {
+            val currentVersion = newRow.getLong("version")
+            newRow.updateLong("version", currentVersion + 1)
+        }
+    }
+}
+
+@Suppress("unused")
+class UpdateChapterAndMangaVersionTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet,
+        newRow: ResultSet,
+    ) {
+        val isSyncing = newRow.getBoolean("is_syncing")
+        val hasChanged =
+            oldRow.getBoolean("read") != newRow.getBoolean("read") ||
+                oldRow.getBoolean("bookmark") != newRow.getBoolean("bookmark") ||
+                oldRow.getInt("last_page_read") != newRow.getInt("last_page_read")
+
+        if (!isSyncing && hasChanged) {
+            val currentVersion = newRow.getLong("version")
+            newRow.updateLong("version", currentVersion + 1)
+
+            val mangaId = newRow.getInt("manga")
+            conn
+                .prepareStatement(
+                    "UPDATE MANGA SET version = version + 1 WHERE id = ? AND NOT is_syncing",
+                ).use {
+                    it.setInt(1, mangaId)
+                    it.executeUpdate()
+                }
+        }
+    }
+}
+
+@Suppress("unused")
+class UpdateMangaLastModifiedAtTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet?,
+        newRow: ResultSet,
+    ) {
+        newRow.updateLong("last_modified_at", Clock.System.now().epochSeconds)
+    }
+}
+
+@Suppress("unused")
+class UpdateChapterLastModifiedAtTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet?,
+        newRow: ResultSet,
+    ) {
+        newRow.updateLong("last_modified_at", Clock.System.now().epochSeconds)
+    }
+}
+
+@Suppress("unused")
+class InsertMangaCategoryUpdateVersionTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet?,
+        newRow: ResultSet,
+    ) {
+        val mangaId = newRow.getInt("manga")
+
+        conn
+            .prepareStatement(
+                "UPDATE MANGA SET version = version + 1 WHERE id = ? AND NOT is_syncing",
+            ).use {
+                it.setInt(1, mangaId)
+                it.executeUpdate()
+            }
+    }
+}
+
+@Suppress("unused")
+class InsertCategoryUidTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet?,
+        newRow: ResultSet,
+    ) {
+        if (newRow.getLong("uid") == 0L) {
+            newRow.updateLong("uid", Random.nextLong(1, Long.MAX_VALUE))
+        }
+
+        if (newRow.getLong("last_modified_at") == 0L) {
+            newRow.updateLong(
+                "last_modified_at",
+                Clock.System.now().epochSeconds,
+            )
+        }
+    }
+}
+
+@Suppress("unused")
+class UpdateCategoryVersionTrigger : TriggerAdapter() {
+    override fun fire(
+        conn: Connection,
+        oldRow: ResultSet,
+        newRow: ResultSet,
+    ) {
+        val isSyncing = newRow.getBoolean("is_syncing")
+        val hasChanged =
+            oldRow.getString("name") != newRow.getString("name") ||
+                oldRow.getInt("sort_order") != newRow.getInt("sort_order")
+
+        if (!isSyncing && hasChanged) {
+            val currentVersion = newRow.getLong("version")
+            newRow.updateLong("version", currentVersion + 1)
+
+            newRow.updateLong(
+                "last_modified_at",
+                Clock.System.now().epochSeconds,
+            )
+        }
+    }
+}

server/src/main/kotlin/suwayomi/tachidesk/server/util/CEFManager.kt

@@ -11,9 +11,7 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
 import kotlinx.coroutines.flow.first
-import kotlinx.coroutines.flow.subscribe
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.runBlocking
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json

server/src/main/kotlin/suwayomi/tachidesk/server/util/WebInterfaceManager.kt

@@ -136,7 +136,7 @@ object WebInterfaceManager {
     fun getAboutInfo(): AboutWebUI {
         val currentVersion = getLocalVersion()
 
-        val failedToGetVersion = currentVersion === "r-1"
+        val failedToGetVersion = currentVersion == "r-1"
         if (failedToGetVersion) {
             throw Exception("Failed to get current version")
         }

server/src/test/kotlin/suwayomi/tachidesk/LooperTest.kt

@@ -2,14 +2,12 @@ package suwayomi.tachidesk
 
 import android.os.Handler
 import android.os.Looper
-import android.os.Message
 import java.util.concurrent.CountDownLatch
 import java.util.concurrent.TimeUnit
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNotEquals
 import kotlin.test.assertTrue
-import kotlin.text.StringBuilder
 
 class LooperThread : Thread() {
     var mHandler: Handler? = null

server/src/test/kotlin/suwayomi/tachidesk/manga/impl/update/TestUpdater.kt

@@ -46,6 +46,7 @@ class TestUpdater : IUpdater {
         TODO("Not yet implemented")
     }
 
+    @Deprecated("Replaced with updates", replaceWith = ReplaceWith("updates"))
     override val status: Flow<UpdateStatus>
         get() = TODO("Not yet implemented")
     override val updates: Flow<UpdateUpdates>

server/src/test/kotlin/suwayomi/tachidesk/test/ApplicationTest.kt

@@ -28,7 +28,6 @@ import suwayomi.tachidesk.server.serverModule
 import suwayomi.tachidesk.server.settings.SettingsRegistry
 import suwayomi.tachidesk.server.util.AppMutex.handleAppMutex
 import suwayomi.tachidesk.server.util.ConfigTypeRegistration
-import suwayomi.tachidesk.server.util.SystemTray
 import uy.kohesive.injekt.Injekt
 import uy.kohesive.injekt.api.get
 import xyz.nulldev.androidcompat.AndroidCompatInitializer