Prune the migration files for Airflow 3#41120
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For a long time now, we have been able to create the metadata database from the ORM without going through the migration files. However, the migration files were not pruned because it would result in users being unable to roll back to a previous version. There's now an opportunity to prune this and start afresh. The migration files are getting more significant, and there are benefits to this pruning. Top in my mind is that the FAB migrations will no longer be in the airflow migration file, which would help in removing FAB from the Airflow core. This change also means we can no longer create a new database from the migration file. We can only do that through the ORM. I considered creating the 'current schema' in the migration file, which means having the database representation in the migration file and helping to create it from scratch. I dropped the idea because there would be elements of FAB in the migration files again. Due to this change, the db command option "--use-migration-files" was removed since this creates the database from the migration file.
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* Prune the migration files for Airflow 3 For a long time now, we have been able to create the metadata database from the ORM without going through the migration files. However, the migration files were not pruned because it would result in users being unable to roll back to a previous version. There's now an opportunity to prune this and start afresh. The migration files are getting more significant, and there are benefits to this pruning. Top in my mind is that the FAB migrations will no longer be in the airflow migration file, which would help in removing FAB from the Airflow core. This change also means we can no longer create a new database from the migration file. We can only do that through the ORM. I considered creating the 'current schema' in the migration file, which means having the database representation in the migration file and helping to create it from scratch. I dropped the idea because there would be elements of FAB in the migration files again. Due to this change, the db command option "--use-migration-files" was removed since this creates the database from the migration file. * fixup! Prune the migration files for Airflow 3
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The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Feb 20, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Feb 23, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Feb 25, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Feb 26, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Mar 10, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Mar 11, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Mar 11, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
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Mar 12, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
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this pull request
Mar 12, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 12, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 12, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 14, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 14, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 14, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 14, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 15, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 15, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
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this pull request
Mar 16, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 16, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
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Mar 17, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
added a commit
to astronomer/airflow
that referenced
this pull request
Mar 17, 2026
… ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions.
ephraimbuddy
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Mar 17, 2026
… ORM/migration files (#62234) * Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files The `--use-migration-files` flag was removed in #41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions. * fixup! Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files * Update edge3 pre-commit file * Remove added fab migration and fix the missing naming convention * Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * fixup! Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * Add fixes for mysql and fab including postgress * Fix conflicts * more inconsistencies fixes * import TIMESTAMP at function level to make provider verification script happy * Harden MySQL migration procedure reuse
fat-catTW
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Mar 22, 2026
… ORM/migration files (apache#62234) * Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions. * fixup! Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files * Update edge3 pre-commit file * Remove added fab migration and fix the missing naming convention * Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * fixup! Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * Add fixes for mysql and fab including postgress * Fix conflicts * more inconsistencies fixes * import TIMESTAMP at function level to make provider verification script happy * Harden MySQL migration procedure reuse
techcodie
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to techcodie/airflow
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Mar 23, 2026
… ORM/migration files (apache#62234) * Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions. * fixup! Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files * Update edge3 pre-commit file * Remove added fab migration and fix the missing naming convention * Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * fixup! Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * Add fixes for mysql and fab including postgress * Fix conflicts * more inconsistencies fixes * import TIMESTAMP at function level to make provider verification script happy * Harden MySQL migration procedure reuse
abhijeets25012-tech
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Apr 9, 2026
… ORM/migration files (apache#62234) * Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files The `--use-migration-files` flag was removed in apache#41120 when we pruned the migration history for Airflow 3. At the time, we couldn't create a database from scratch using only migration files because the migration chain no longer started from an empty database. The oldest migration assumed an existing 2.6.2 schema. Now that we have a squashed migration (0000_2_6_2) with `down_revision = None` that creates the full baseline schema from scratch, we can re-introduce this flag. This enables a critical development workflow, which is: creating the database purely from migration files, then using `alembic revision --autogenerate` to detect schema drift between the ORM models and the migration-produced schema. Without this flag, `autogenerate` compares against an ORM-created database (via `create_all`), which masks any drift since both sides come from the same ORM definitions. * fixup! Re-introducing `--use-migration-files` and fix inconsistences between ORM/migration files * Update edge3 pre-commit file * Remove added fab migration and fix the missing naming convention * Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * fixup! Fix inconsistencies in providers(fab/edge3) and also fix the edge3 pre-commit * Add fixes for mysql and fab including postgress * Fix conflicts * more inconsistencies fixes * import TIMESTAMP at function level to make provider verification script happy * Harden MySQL migration procedure reuse
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For a long time now, we have been able to create the metadata database from the ORM without going through the migration files. However, the migration files were not pruned because it would result in users being unable to roll back to a previous version. There's now an opportunity to prune this and start afresh. The migration files are getting more significant, and there are benefits to this pruning. Top in my mind is that the FAB migrations will no longer be in the airflow migration file, which would help in removing FAB from the Airflow core.
This change also means we can no longer create a new database from the migration file. We can only do that through the ORM. I considered creating the 'current schema' in the migration file, which means having the database representation in the migration file and helping to create it from scratch. I dropped the idea because there would be elements of FAB in the migration files again.
Due to this change, the db command option "--use-migration-files" was removed since this creates the database from the migration file.