phsl / new-api

The options table on some long-lived deployments has no PRIMARY KEY on key, so mutateModelPricingOptions' ON CONFLICT DO NOTHING insert added duplicate default rows that overwrote real pricing on read and made model pricing updates appear to succeed without persisting across nodes.

- Read pricing rows under FOR UPDATE first and only insert defaults for keys that are missing; log when duplicate pricing keys are found.
- Add migrateOptionPrimaryKey: detect a missing unique key (including PostgreSQL constraint-backed keys), take a per-dialect lock, dedupe rows last-wins, rebuild into a temp table with the primary key, swap atomically, and keep the old rows in options_legacy_<ts>. Idempotent and non-blocking on failure.
- Run it in migrateDB before AutoMigrate on the master node.