016_add_products_and_task_product_id used `sa.Enum(..., create_type=False)`
for the reused Postgres "team" enum — the same latent defect that crashed
052 on a real orchestrator boot. On the generic `sa.Enum` the
`create_type` kwarg is silently dropped, so `_check_for_name_in_memos`
never sees it and `op.create_table` (checkfirst=False) emits a redundant
`CREATE TYPE team` that fails with "type 'team' already exists" against a
DB where the enum pre-exists.
Switch to the postgres-native `postgresql.ENUM(..., create_type=False)` —
its `create_type` is a real attribute the guard reads, so the CREATE TYPE
is suppressed (and DROP TYPE on downgrade too). The member list is inert
under create_type=False (it never creates/alters the type), so it stays at
016's original six, reflecting the enum as it stood then, not the
later-widened set.
This never crashed in prod because 016 is never re-run (alembic_version is
past it), but it's the same defect class. Verified on the real boot path:
upgrade to 015 in process A (team enum created by 001), then `upgrade head`
in a fresh process B — 016 applied clean, no DuplicateObjectError; downgrade
016->015 clean, shared team enum preserved.
See project_migration_enum_create_type_gotcha.
Renn F
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