PLAYER CALLS IMMUTABLE AFTER LOCK

A call is immutable after its clock closes — it cannot be edited, deleted, or made twice, and the store refuses an insert after the horizon or a resolution.

no UPDATE path on player_calls; UNIQUE (payer, decision); server-computed horizon; DB trigger refuses post-horizon/resolved inserts

apps/api calls-rail.db + tests/calls.test.ts (38/38)

DB access required for trigger tests (Docker-gated)