diff --git a/Qwilight/System/DB.cs b/Qwilight/System/DB.cs
index 53ef115..563a62c 100644
--- a/Qwilight/System/DB.cs
+++ b/Qwilight/System/DB.cs
@@ -80,15 +80,15 @@
                 Compatible.Compatible.DB(_fastDB);
                 #endregion
 
-                HandleStatements(ta =>
+                HandleStatements(t =>
                 {
                     #region 데이터베이스 정보
                     Date date;
-                    using (var dbStatement = NewDBStatement("PRAGMA user_version", ta))
+                    using (var dbStatement = NewDBStatement("PRAGMA user_version", t))
                     {
                         date = (Date)dbStatement.ExecuteScalar();
                     }
-                    using (var dbStatement = NewDBStatement($"PRAGMA user_version = {((long)LatestDBDate)}", ta))
+                    using (var dbStatement = NewDBStatement($"PRAGMA user_version = {((long)LatestDBDate)}", t))
                     {
                         dbStatement.ExecuteNonQuery();
                     }
@@ -156,11 +156,11 @@
                                 Is_Paused INTEGER DEFAULT 0,
                                 Input_Flags INTEGER DEFAULT 0
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("comment", ta))
+                        if (HasTable("comment", t))
                         {
                             // Input_Favor_Labelled_Millis
                             using (var dbStatement = NewDBStatement("""
@@ -168,11 +168,11 @@
                                 INTO tmp_comment(Date, Event_Note_ID, Comment, Name, Multiplier, Auto_Mode, Note_Salt_Mode, Audio_Multiplier, Faint_Note_Mode, Judgment_Mode, Hit_Points_Mode, Note_Mobility_Mode, Long_Note_Mode, Input_Favor_Mode, Note_Modify_Mode, BPM_Mode, Wave_Mode, Set_Note_Mode, Lowest_Judgment_Condition_Mode, Stand, Band, Is_Band1, Point, Salt, Highest_Judgment_0, Higher_Judgment_0, High_Judgment_0, Low_Judgment_0, Lower_Judgment_0, Lowest_Judgment_0, Highest_Judgment_1, Higher_Judgment_1, High_Judgment_1, Low_Judgment_1, Lower_Judgment_1, Lowest_Judgment_1, Lowest_Long_Note_Modify, Highest_Long_Note_Modify, Set_Note_Put, Set_Note_Put_Millis, Highest_Hit_Points_0, Higher_Hit_Points_0, High_Hit_Points_0, Low_Hit_Points_0, Lower_Hit_Points_0, Lowest_Hit_Points_0, Highest_Hit_Points_1, Higher_Hit_Points_1, High_Hit_Points_1, Low_Hit_Points_1, Lower_Hit_Points_1, Lowest_Hit_Points_1, Note_ID, Is_Paused, Input_Flags)
                                     SELECT *
                                     FROM comment
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE comment", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE comment", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -180,7 +180,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_comment
                             RENAME TO comment
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -189,7 +189,7 @@
                                 Note_ID,
                                 Event_Note_ID
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -205,22 +205,22 @@
                                 Note_Position INTEGER,
                                 PRIMARY KEY (Entry_Path)
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("entry", ta))
+                        if (HasTable("entry", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_entry
                                     SELECT *
                                     FROM entry
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE entry", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE entry", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -228,7 +228,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_entry
                             RENAME TO entry
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -243,22 +243,22 @@
                                 Note_ID VARCHAR(139),
                                 Favorite_Entry TEXT
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("favorite_entry", ta))
+                        if (HasTable("favorite_entry", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_favorite_entry
                                     SELECT *
                                     FROM favorite_entry
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE favorite_entry", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE favorite_entry", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -266,7 +266,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_favorite_entry
                             RENAME TO favorite_entry
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -274,7 +274,7 @@
                             CREATE INDEX IF NOT EXISTS _favorite_entry ON favorite_entry (
                                 Note_ID
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -290,22 +290,22 @@
                                 Handled INTEGER,
                                 PRIMARY KEY (Note_ID)
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("handled", ta))
+                        if (HasTable("handled", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_handled
                                     SELECT *
                                     FROM handled
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE handled", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE handled", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -313,7 +313,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_handled
                             RENAME TO handled
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -329,22 +329,22 @@
                                 Event_Note_ID TEXT,
                                 Date DATE
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("date", ta))
+                        if (HasTable("date", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_date
                                     SELECT *
                                     FROM date
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE date", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE date", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -352,7 +352,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_date
                             RENAME TO date
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -361,7 +361,7 @@
                                 Note_ID,
                                 Event_Note_ID
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -379,22 +379,22 @@
                                 Media LONG DEFAULT 1,
                                 PRIMARY KEY (Note_ID)
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("wait", ta))
+                        if (HasTable("wait", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_wait
                                     SELECT *
                                     FROM wait
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE wait", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE wait", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -402,7 +402,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_wait
                             RENAME TO wait
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -418,22 +418,22 @@
                                 Format LONG DEFAULT -1,
                                 PRIMARY KEY (Note_ID)
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("format", ta))
+                        if (HasTable("format", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_format
                                     SELECT *
                                     FROM format
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE format", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE format", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -441,7 +441,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_format
                             RENAME TO format
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -459,22 +459,22 @@
                                 Variety INTEGER DEFAULT 0,
                                 PRIMARY KEY (Event_Note_ID, Variety)
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("event_note", ta))
+                        if (HasTable("event_note", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_event_note
                                     SELECT *
                                     FROM event_note
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE event_note", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE event_note", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -482,7 +482,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_event_note
                             RENAME TO event_note
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -503,22 +503,22 @@
                                 Genre TEXT,
                                 PRIMARY KEY (Note_ID)
                             )
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
-                        if (HasTable("event_note_data", ta))
+                        if (HasTable("event_note_data", t))
                         {
                             using (var dbStatement = NewDBStatement("""
                                 INSERT
                                 INTO tmp_event_note_data
                                     SELECT *
                                     FROM event_note_data
-                            """, ta))
+                            """, t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
-                            using (var dbStatement = NewDBStatement("DROP TABLE event_note_data", ta))
+                            using (var dbStatement = NewDBStatement("DROP TABLE event_note_data", t))
                             {
                                 dbStatement.ExecuteNonQuery();
                             }
@@ -526,7 +526,7 @@
                         using (var dbStatement = NewDBStatement("""
                             ALTER TABLE tmp_event_note_data
                             RENAME TO event_note_data
-                        """, ta))
+                        """, t))
                         {
                             dbStatement.ExecuteNonQuery();
                         }
@@ -888,13 +888,13 @@
 
         public void SetFavoriteEntry(BaseNoteFile noteFile)
         {
-            HandleStatements(ta =>
+            HandleStatements(t =>
             {
                 using (var dbStatement = NewDBStatement("""
                     DELETE
                     FROM favorite_entry
                     WHERE Note_ID = @noteID
-                """, ta))
+                """, t))
                 {
                     dbStatement.Parameters.AddWithValue("noteID", noteFile.GetNoteID512());
                     dbStatement.ExecuteNonQuery();
@@ -905,7 +905,7 @@
                         REPLACE
                         INTO favorite_entry
                         VALUES(@noteID, @favoriteEntry)
-                    """, ta))
+                    """, t))
                     {
                         dbStatement.Parameters.AddWithValue("noteID", noteFile.GetNoteID512());
                         dbStatement.Parameters.AddWithValue("favoriteEntry", favoriteEntryItem.DefaultEntryPath);
@@ -1103,16 +1103,37 @@
 
         void HandleStatements(Action<SqliteTransaction> onHandle)
         {
-            using var ta = _fastDB.BeginTransaction();
             try
             {
-                onHandle(ta);
-                ta.Commit();
+                _dbCSX.EnterWriteLock();
+                using var t = _fastDB.BeginTransaction();
+                try
+                {
+                    onHandle(t);
+                    t.Commit();
+                }
+                catch
+                {
+                    t.Rollback();
+                    throw;
+                }
             }
-            catch
+            finally
             {
-                ta.Rollback();
-                throw;
+                _dbCSX.ExitWriteLock();
+            }
+        }
+
+        void HandleCSX(Action onHandle)
+        {
+            try
+            {
+                _dbCSX.EnterReadLock();
+                onHandle();
+            }
+            finally
+            {
+                _dbCSX.ExitReadLock();
             }
         }