From 694db80d4c8e83ff381af56d2a3dde29e0855c3d Mon Sep 17 00:00:00 2001
From: Shadowghost <Ghost_of_Stone@web.de>
Date: Fri, 30 Jan 2026 21:58:24 +0100
Subject: Reroute on version removal

---
 MediaBrowser.Controller/Library/ILibraryManager.cs     |  9 +++++++++
 MediaBrowser.Controller/Persistence/IItemRepository.cs | 17 +++++++++++++++++
 2 files changed, 26 insertions(+)

(limited to 'MediaBrowser.Controller')

diff --git a/MediaBrowser.Controller/Library/ILibraryManager.cs b/MediaBrowser.Controller/Library/ILibraryManager.cs
index c19d15d85f..48859de04b 100644
--- a/MediaBrowser.Controller/Library/ILibraryManager.cs
+++ b/MediaBrowser.Controller/Library/ILibraryManager.cs
@@ -714,5 +714,14 @@ namespace MediaBrowser.Controller.Library
         /// <param name="virtualFolderPath">The path to the virtualfolder.</param>
         /// <param name="pathInfo">The new virtualfolder.</param>
         public void CreateShortcut(string virtualFolderPath, MediaPathInfo pathInfo);
+
+        /// <summary>
+        /// Re-routes LinkedChildren references from one child to another.
+        /// Used when video versions change to maintain playlist/BoxSet integrity.
+        /// </summary>
+        /// <param name="fromChildId">The child ID to re-route from.</param>
+        /// <param name="toChildId">The child ID to re-route to.</param>
+        /// <returns>Number of references updated.</returns>
+        int RerouteLinkedChildReferences(Guid fromChildId, Guid toChildId);
     }
 }
diff --git a/MediaBrowser.Controller/Persistence/IItemRepository.cs b/MediaBrowser.Controller/Persistence/IItemRepository.cs
index f7ed39730e..504adff86c 100644
--- a/MediaBrowser.Controller/Persistence/IItemRepository.cs
+++ b/MediaBrowser.Controller/Persistence/IItemRepository.cs
@@ -210,4 +210,21 @@ public interface IItemRepository
     /// <param name="userId">The user ID for access filtering.</param>
     /// <returns>Dictionary mapping parent ID to child count.</returns>
     Dictionary<Guid, int> GetChildCountBatch(IReadOnlyList<Guid> parentIds, Guid? userId);
+
+    /// <summary>
+    /// Gets parent IDs (Playlists/BoxSets) that reference the specified child with LinkedChildType.Manual.
+    /// </summary>
+    /// <param name="childId">The child item ID.</param>
+    /// <returns>List of parent IDs that reference the child.</returns>
+    IReadOnlyList<Guid> GetManualLinkedParentIds(Guid childId);
+
+    /// <summary>
+    /// Updates LinkedChildren references from one child to another, preserving SortOrder.
+    /// Handles duplicates: if parent already references toChildId, removes the old reference instead.
+    /// Used when video versions change to maintain collection integrity.
+    /// </summary>
+    /// <param name="fromChildId">The child ID to re-route from.</param>
+    /// <param name="toChildId">The child ID to re-route to.</param>
+    /// <returns>Number of references updated.</returns>
+    int RerouteLinkedChildren(Guid fromChildId, Guid toChildId);
 }
-- 
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