Fix mangas query with active sorting and postgresql db (#2042)

fixes #2036

CHANGELOG.md

@@ -21,6 +21,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 - (**Extension**) Do not indicate an update is available when the extension is not installed
 - (**Chapter**) Fix losing chapter data on failed chapter list update
 - (**Chapter**) Fix database error when fetching chapter updates
+- (**Manga/API**) Fix "mangas" graphql query with active sorting and using a postgresql database (QUERY "mangas")
 
 ## [v2.2.2100] + [WebUI: v20260508.01] - 2026-05-08
 

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

@@ -247,11 +247,18 @@ class MangaQuery {
                     MangaTable
                         .leftJoin(CategoryMangaTable)
                         .select(MangaTable.columns)
-                        .withDistinctOn(MangaTable.id)
+
+                val applySorting = order != null || orderBy != null || (last != null || before != null)
+
+                if (applySorting) {
+                    res.withDistinctOn(MangaTable.id to SortOrder.ASC)
+                } else {
+                    res.withDistinctOn(MangaTable.id)
+                }
 
                 res.applyOps(condition, filter)
 
-                if (order != null || orderBy != null || (last != null || before != null)) {
+                if (applySorting) {
                     val baseSort = listOf(MangaOrder(MangaOrderBy.ID, SortOrder.ASC))
                     val deprecatedSort = listOfNotNull(orderBy?.let { MangaOrder(orderBy, orderByType) })
                     val actualSort = (order.orEmpty() + deprecatedSort + baseSort)