PASS: exact live MariaDB metadata passes
PASS: nullable uppercase NULL metadata is canonicalized only where expected
PASS: no existing relation
PASS: one correct relation
PASS: two duplicate correct relations
PASS: incorrect plus correct relation
PASS: multiple incorrect relations
PASS: duplicate app mapping
PASS: repeated normalization is idempotent
PASS: preupdate and postupdate repetition stays canonical
PASS: unresolved Tools parent fails closed
PASS: schema mismatch fails closed
PASS: unrelated module rows remain untouched
PASS: unresolved module fails closed