I'm on the free tier. In my case it looks like adding `app.config["SQLALCHEMY_ENGINE_OPTIONS"] = {"pool_pre_ping": True}` for the Flask-SQLAlchemy configuration

I'm on the free tier. In my case it looks like adding `app.config["SQLALCHEMY_ENGINE_OPTIONS"] = {"pool_pre_ping": True}` for the Flask-SQLAlchemy configuration did the trick. I hope to be a paying customer soon :)