delete_restricted
What happened
This entry can’t be deleted because other records still reference it. Delete the dependent entries first.
Technical background
ConflictError from the cascade-delete guard: the delete was prevented
because dependent rows exist.
details.blockingEntity, details.entity and details.entityId show
which relation is blocking. Set relation.onDelete to "cascade" or
"setNull" if automatic cleanup is desired, or delete the dependent
rows first.