The core assertion: the environment-configured tag and the database's
sentinel row must both exist and agree. Throws DeploymentIdentityError on
any other outcome — missing binding, malformed tag, unseeded database,
mismatch. One cheap invariant instead of predicates on every query.
The core assertion: the environment-configured tag and the database's sentinel row must both exist and agree. Throws DeploymentIdentityError on any other outcome — missing binding, malformed tag, unseeded database, mismatch. One cheap invariant instead of predicates on every query.