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Python classes for my data, but no tables yet, and no safe way to change them later.
What you'll have at the end
A live Postgres table matching your model, created by a migration script you can re-run on a fresh database
You need
A set of SQLAlchemy model classes already written, and a database already running and reachable from your code.
Not covered
Changing a column on a table that already holds real rows, which needs a more careful, incremental approach than a first migration does.
Checked 18 Aug 2026
Part of the ORM and Database Abstraction Tools cookbook