PostgreSQL GRANT Failures Decoded: The Complete Guide to Invalid Grantor Errors

PostgreSQL's 0L000 invalid grantor error reveals a critical gap in privilege delegation: GRANT OPTION doesn't cascade through role hierarchies, meaning administrators must explicitly configure permission re-granting at each level. For teams managing multi-tenant databases or complex access control models, misunderstanding the distinction between object ownership, grant options, and role inheritance directly impacts both security and operational uptime. This guide's systematic breakdown of the three main failure patterns equips administrators to build reliable privilege delegation chains.