feat(app_factory): speed up api startup (#11762)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/app.py

@@ -1,13 +1,30 @@
-from app_factory import create_app
-from libs import threadings_utils, version_utils
+from libs import version_utils
 
 # preparation before creating app
 version_utils.check_supported_python_version()
-threadings_utils.apply_gevent_threading_patch()
+
+
+def is_db_command():
+    import sys
+
+    if len(sys.argv) > 1 and sys.argv[0].endswith("flask") and sys.argv[1] == "db":
+        return True
+    return False
+
 
 # create app
-app = create_app()
-celery = app.extensions["celery"]
+if is_db_command():
+    from app_factory import create_migrations_app
+
+    app = create_migrations_app()
+else:
+    from app_factory import create_app
+    from libs import threadings_utils
+
+    threadings_utils.apply_gevent_threading_patch()
+
+    app = create_app()
+    celery = app.extensions["celery"]
 
 if __name__ == "__main__":
     app.run(host="0.0.0.0", port=5001)