This is a great idea. You have my $10. (FWIW, advanced Flask-SQLAlchemy topics (relationsips, queries, association tables, alembic etc) and also security issue

This is a great idea. You have my $10. (FWIW, advanced Flask-SQLAlchemy topics (relationsips, queries, association tables, alembic etc) and also security issues (what to watch out for with Flask, jinja and WTForms if anything) would be my picks for useful chapters.)