Merge pull request #17554 from IDisposable/fix/faster-update-items

Speed up UpdateOrInsertItems for related information

Jellyfin.Server.Implementations/Item/ItemPersistenceService.cs

@@ -257,14 +257,14 @@ public class ItemPersistenceService : IItemPersistenceService
         using var transaction = context.Database.BeginTransaction();
 
         var ids = tuples.Select(f => f.Item.Id).ToArray();
-        var existingItems = context.BaseItems.Where(e => ids.Contains(e.Id)).Select(f => f.Id).ToArray();
+        var existingItems = context.BaseItems.Where(e => ids.Contains(e.Id)).Select(f => f.Id).ToHashSet();
 
         foreach (var item in tuples)
         {
             var entity = BaseItemMapper.Map(item.Item, _appHost);
             entity.TopParentId = item.TopParent?.Id;
 
-            if (!existingItems.Any(e => e == entity.Id))
+            if (!existingItems.Contains(entity.Id))
             {
                 context.BaseItems.Add(entity);
             }
@@ -314,9 +314,11 @@ public class ItemPersistenceService : IItemPersistenceService
         }).ToArray();
         context.ItemValues.AddRange(missingItemValues);
 
-        var itemValuesStore = existingValues.Concat(missingItemValues).ToArray();
+        var itemValuesStore = existingValues
+            .Concat(missingItemValues)
+            .ToDictionary(e => (e.Type, e.Value));
         var valueMap = itemValueMaps
-            .Select(f => (f.Item, Values: f.Values.Select(e => itemValuesStore.First(g => g.Value == e.Value && g.Type == e.MagicNumber)).DistinctBy(e => e.ItemValueId).ToArray()))
+            .Select(f => (f.Item, Values: f.Values.Select(e => itemValuesStore[(e.MagicNumber, e.Value)]).DistinctBy(e => e.ItemValueId).ToArray()))
             .ToArray();
 
         var mappedValues = context.ItemValuesMap.Where(e => ids.Contains(e.ItemId)).ToList();