From 89bbdb17fb4ed1cbe99c14f389940e0f91093a10 Mon Sep 17 00:00:00 2001
From: NarwhalHorns <onefailedgamer@gmail.com>
Date: Sat, 21 Feb 2026 10:26:36 +0000
Subject: [PATCH] Utilize tracker for library duplicate detection (#2978)

Co-authored-by: AntsyLich <59261191+AntsyLich@users.noreply.github.com>
---
 CHANGELOG.md                                    |  1 +
 .../main/sqldelight/tachiyomi/data/mangas.sq    | 17 ++++++++++++++---
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7cf728ffb..29f65c584 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ The format is a modified version of [Keep a Changelog](https://keepachangelog.co
 - Reword download reindexing message to avoid confusion ([@MajorTanya](https://github.com/MajorTanya)) ([#2874](https://github.com/mihonapp/mihon/pull/2874))
 - Rework internals for better performance ([@Lolle2000la](https://github.com/Lolle2000la)) ([#2955](https://github.com/mihonapp/mihon/pull/2955))
 - Optimize tracked library filter ([@NarwhalHorns](https://github.com/NarwhalHorns)) ([#2977](https://github.com/mihonapp/mihon/pull/2977))
+- Utilize tracker for library duplicate detection ([@NarwhalHorns](https://github.com/NarwhalHorns)) ([#2977](https://github.com/mihonapp/mihon/pull/2978))
 
 ### Changed
 - Update tracker icons ([@AntsyLich](https://github.com/AntsyLich)) ([#2773](https://github.com/mihonapp/mihon/pull/2773))
diff --git a/data/src/main/sqldelight/tachiyomi/data/mangas.sq b/data/src/main/sqldelight/tachiyomi/data/mangas.sq
index ff607e9d9..8125360c0 100644
--- a/data/src/main/sqldelight/tachiyomi/data/mangas.sq
+++ b/data/src/main/sqldelight/tachiyomi/data/mangas.sq
@@ -118,12 +118,23 @@ AND source = :sourceId;
 
 getDuplicateLibraryManga:
 WITH
+track_dupes AS (
+    SELECT S2.manga_id
+    FROM manga_sync S1
+    INNER JOIN manga_sync S2
+    ON S1.sync_id = S2.sync_id
+    AND S1.remote_id = S2.remote_id
+    AND S1.manga_id != S2.manga_id
+    WHERE S1.manga_id = :id
+),
 duplicates AS (
-    SELECT *
-    FROM mangas
+    SELECT M.*
+    FROM mangas M
+    LEFT JOIN track_dupes D
+    ON D.manga_id = _id
     WHERE favorite = 1
     AND _id != :id
-    AND lower(title) LIKE '%' || lower(:title) || '%'
+    AND (lower(title) LIKE '%' || lower(:title) || '%' OR D.manga_id IS NOT NULL)
 ),
 chapter_counts AS (
     SELECT