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added SQLALCHEMY_TRACK_MODIFICATIONS = False to stop initial warning when running newly generated app.
flask fab create-app
and set database SQLAlchemy,flask run
The first message to appear is:
[path-to-venv]\Lib\site-packages\flask_sqlalchemy_init_.py:872: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICATIONS adds significant overhead and will be disabled by default in the future. Set it to True or False to suppress this warning.
Solution
To fix this, the line has been added to the config.tpl file.