pg_dump ran with --no-acl --no-owner, so single-database backups lost
all GRANTs and a restored Supabase database did not work. The import
already skips owners and privileges unless "Keep owners and privileges"
is selected, so the backup now keeps them.
Closes#12244
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>