What is stored in the alembic_version table?

Question

Python

Please help me understand what role the alembic_version table plays.
I created a model and based on it using flask db migrate / flask db upgrade created a table in the database. Then I removed this table from the database and tried to create it again via flask db migrate/flask db upgrade. But the table was not created.
Again, I was only able to create the table after dropping the alembic_version table. I don't understand how alembic_version remembers that such a table has already been created. And in general, why does it not allow to re-create the table

Answer 1

It stores the history of migrations.