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Remove Alembic database migration system in favor of delta scripts: Deleted: - runtime/datamate-python/alembic.ini (config file) - runtime/datamate-python/alembic/env.py (environment config) - runtime/datamate-python/alembic/script.py.mako (migration template) - runtime/datamate-python/alembic/versions/20250205_0001_add_file_version.py (migration) Modified: - scripts/db/data-annotation-init.sql - Removed alembic_version table creation and version insertion - Kept file_version column in t_dm_annotation_results Rationale: - Alembic migration testing failed in production - Delta scripts are simpler and more reliable for this project - SQL init scripts contain complete schema including latest changes