How to clear history and run all migrations from the beginning?
Alembic is keeping track of the migrations in the alembic_version table on your database.
Simple drop the table to start from scratch using the following command:
DROP TABLE alembic_version;
And then try to run your migration again!
How I can clear history using alembic?  I couldn't find this option in alembic history.  I want to run from the first migration rather than the last applied.