Avoid dropping version table for offline SQL base#1824
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Description
When offline SQL generation ends at
base, Alembic emittedDROP TABLE alembic_version. This removes that offline-only table drop so SQL output matches online behavior: Alembic updates version rows but does not drop the version table.Fixes #1822.
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Validation
/tmp/alembic-pr-venv/bin/python -m pytest tests/test_command.py::UpgradeDowngradeStampTest -q/tmp/alembic-pr-venv/bin/python -m pytest tests/test_command.py -k stamp -q/tmp/alembic-pr-venv/bin/python -m pytest tests/test_command.py -q/tmp/alembic-pr-venv/bin/python -m compileall -q alembic/runtime/migration.py tests/test_command.py