feat(config): add live slow-sql threshold setting

db/migrations.py

@@ -74,6 +74,7 @@ def _get_migration_steps():
         (17, _migrate_to_v17),
         (18, _migrate_to_v18),
         (19, _migrate_to_v19),
+        (20, _migrate_to_v20),
     ]
 
 
@@ -884,3 +885,21 @@ def _migrate_to_v19(conn):
         cursor.execute(statement)
 
     conn.commit()
+
+
+
+def _migrate_to_v20(conn):
+    """迁移到版本20 - 慢SQL阈值系统配置"""
+    cursor = conn.cursor()
+
+    columns = _get_table_columns(cursor, "system_config")
+    _add_column_if_missing(
+        cursor,
+        "system_config",
+        columns,
+        "db_slow_query_ms",
+        "INTEGER DEFAULT 120",
+        ok_message="  [OK] 添加 system_config.db_slow_query_ms 字段",
+    )
+
+    conn.commit()