Read the database's sentinel tag, or undefined when seeding has not completed
(no table, or the exact table exists with no row after an interrupted write).
A malformed schema or duplicate row throws DeploymentIdentityError. Any OTHER
database error (a transient D1 fault) propagates unchanged: an outage is an
availability problem and must not be misreported as "unprovisioned".
Read the database's sentinel tag, or undefined when seeding has not completed (no table, or the exact table exists with no row after an interrupted write). A malformed schema or duplicate row throws DeploymentIdentityError. Any OTHER database error (a transient D1 fault) propagates unchanged: an outage is an availability problem and must not be misreported as "unprovisioned".