feat: database migration

pkg/persistence/migrations/dbm001_migrate_v3_config.py

@@ -0,0 +1,13 @@
+from .. import migration
+
+# TODO fill this
+# @migration.migration_class(1)
+# class DBMigrationV3(migration.DBMigration):
+#     """数据库迁移"""
+
+#     async def upgrade(self):
+#         """升级"""
+#         pass
+
+#     async def downgrade(self):
+#         """降级"""