Update preserve flag outside of transaction

osu.Server.Queues.ScoreStatisticsProcessor/ScoreStatisticsQueueProcessor.cs

@@ -156,15 +156,17 @@ protected override void ProcessResult(ScoreItem item)
 
                         updateHistoryEntry(item, conn, transaction);
 
-                        if (score.Passed)
-                        {
-                            // For now, just assume all passing scores are to be preserved.
-                            conn.Execute("UPDATE scores SET preserve = 1 WHERE id = @Id", new { Id = score.ID }, transaction);
-                        }
-
                         transaction.Commit();
                     }
 
+                    // Intentionally not part of the transaction to avoid deadlocks.
+                    // See https://discord.com/channels/90072389919997952/983550677794050108/1199725169573380136
+                    if (score.Passed)
+                    {
+                        // For now, just assume all passing scores are to be preserved.
+                        conn.Execute("UPDATE scores SET preserve = 1 WHERE id = @Id", new { Id = score.ID });
+                    }
+
                     foreach (var p in enumerateValidProcessors(score))
                         p.ApplyGlobal(score, conn);
                 }