An epc_property row can carry a null property_id (FE/historic ingestion
persists EPC rows never linked to a property row), so a property_id-keyed
read silently misses them. UPRN is the durable key both the property row
and the epc_property row share. Repoint the lodged reads (get_for_property
+ get_for_properties) onto UPRN; the predicted reads stay on property_id
because a predicted EPC deep-copies a neighbour's UPRN, so its UPRN column
is never the property's own.
UPRN is not unique on epc_property, so the read tie-break is now load-
bearing (it was dormant under property_id, where the write path guarantees
one lodged row per property): the most recently ingested (highest-id) row
wins. Write path stays keyed on (property_id, source).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>