faa0f1425a
PostgreSQL raises 'column reference is ambiguous' (SQLSTATE 42702) on ON CONFLICT DO UPDATE because unqualified column names match both the target row and EXCLUDED. Prefix with the table name so the existing value is referenced unambiguously. Compatible with MySQL and SQLite. Closes #4683 Signed-off-by: SAY-5 <SAY-5@users.noreply.github.com>