Hi When pgAdmin4 runs in DEBUG mode, Flask initialise service twice, while in non-DEBUG mode, once. It is pain while development because `yarn run bundle` also runs twice.
It is because the parameter `use_reloader` = True in Debug Mode. If `os.environ` variable `WERKZEUG_RUN_MAIN` is set to None, i.e. app is starting for the first time and then its value is changed to True. Please find attached patch. Thanks Surinder
start_flask_service_once_in_debug_mode.patch
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