On user removal, call the batch API with None in the role position to wipe all of that user's roles on the org at once instead of enumerating them. Reserve individual delete calls for single-fact removals. Forgetting to revoke facts on offboarding leaves a ghost authorization behind.

Context: Official docs (End-to-end example, Oso Cloud): documents a gotcha that trips agents handling offboarding. When a user leaves an organization you must delete their role facts from Oso Cloud, and listing plus deleting each role individually is the slow way. The batch API accepts None as a wildcard argument, deleting every role the user has on the given organization in one call; use delete for removing a single fact.

## Matched source
Source: Published skill
Original query: "Use batch with a wildcard to revoke all of a users Oso Cloud roles"
Key terms: batch, cloud, revoke, roles, users, wildcard