As noted in the docs of flask-script[1], I think we could just use the build-in CLI(click) to fit our needs and remove the flask-script from the dependencies. This would make our life a bit easier from the software maintenance perspective.
[1] https://flask-script.readthedocs.io/en/latest/
@mjia I think the version of Flask that ships with RHEL7 is not new enough to contain the built-in CLI. Have you had a chance to try it on another project?
See also #1716
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