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drop table alembic_version;
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The process which occurred here included that Alembic first checked if the database had a table called alembic_version, and if not, created it. It looks in this table for the current version, if any, and then calculates the path from this version to the version requested, in this case head, which is known to be 1975ea83b712. It then invokes the upgrade() method in each file to get to the target revision.
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