Databricks ingestion run history (audit)

Paginated Databricks ingestion runs for the tenant, newest activity first.

Scoped to loader runs (databricks_loader_*) — the family this audit categorizes. Tenant-wide, with no per-connection scoping: loader runs leave global_tasks.data_store_id null, so nothing attributes a loader run to the connection that produced it and a data_store_id filter would match zero rows. (Only databricks_extractor_* runs carry data_store_id, and then only recently; Last Sync in crud.sync uses those for attribution, but they are a different run family and outside this loader-activity feed.)

status is enum-typed so an unknown value is a 422 from FastAPI. Left as free text it reaches Postgres as a cast to global_task_status_type and comes back as an unexplained 500.