agrag.graphdb.errors.GraphStoreConstraintViolationError

Bases: GraphStoreError

A write violated a uniqueness constraint the backend enforces.

Raised instead of letting the backend's own driver exception propagate, so callers can recognize this specific case -- for example, two concurrent writers both missing an exact-match lookup and racing to create the same merge_key -- and recover by re-resolving to whichever write landed first, rather than treating it as a fatal error.