mir-backend-python-flask

Make It Right (Flask module). Flask 3 specific reliability augmentation. Use alongside the mir-backend skill when the target stack is Flask — it carries the mechanical footguns that the framework-agnostic skill deliberately omits: app/request context misuse (current_app/request/g outside context), missing input validation and object-level authorization, SQLAlchemy session scoping and teardown, app-factory pattern and circular import avoidance, offloading heavy work to Celery/RQ, config/secret safety (debug=True RCE, SECRET_KEY), and Alembic migration safety via Flask-Migrate. TRIGGER only when the Python backend stack is Flask — building, reviewing, or debugging a Flask route, blueprint, extension, SQLAlchemy session, or migration. Always loads TOGETHER WITH mir-backend (the gates) and mir-backend-python (CPython runtime concerns: GIL, async/sync, fork-safety, cold start); this module only adds Flask library mechanics. SKIP for Django, FastAPI, or any non-Flask stack (those get their own mir-backend-python-<framework> module), and for non-Python runtimes.