GaneshPatil7517 opened a new pull request, #60307:
URL: https://github.com/apache/airflow/pull/60307
## What does this PR do?
Adds database indexes on `task_instance.dag_version_id` and
`dag_run.created_dag_version_id` to fix the slow performance of `airflow db
clean -t dag_version` command.
## Why is this needed?
When running `airflow db clean -t dag_version --batch-size 1000`, the
cleanup process was taking ~6 minutes per batch on tables with 300K+ rows. The
root cause was missing indexes on the foreign key columns that reference
`dag_version.id`.
The cleanup code in `db_cleanup.py` defines `dag_version` with
`dependent_tables=["task_instance", "dag_run"]`, meaning every delete operation
needs to check both tables for FK violations. Without indexes, PostgreSQL
performs full table scans.
## What changed?
1. **New migration**
(`0098_3_2_0_add_dag_version_id_indexes_for_db_cleanup.py`):
- Adds `idx_task_instance_dag_version_id` on
`task_instance(dag_version_id)`
- Adds `idx_dag_run_created_dag_version_id` on
`dag_run(created_dag_version_id)`
2. **Updated ORM models**: Added indexes to `__table_args__` for schema
consistency
## Performance Impact
| Scenario | Before | After |
|----------|--------|-------|
| `db clean -t dag_version` (300K rows, batch=1000) | ~6 min/batch | < 2 min
total |
Fixes #60145
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