[econ] room key award

apps/econ/migrations/0025_room_key_player.sql

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+-- Who HOLDS a room key — one row per (key, player).
+--
+-- Written by `POST /api/roomkeys/v1/awardbulk`, which awards the CALLER the keys its body
+-- names. A key is held or it isn't — there is no quantity — so the pair is the primary key
+-- and awarding a key a player already holds changes nothing (`awarded_at` keeps the first
+-- award). `room_key_id` is `room_key.room_key_id`. Owned by the `econ` worker; generated
+-- from src/room-key-db.ts (ROOM_KEY_SCHEMA_DDL) — keep in sync.
+CREATE TABLE IF NOT EXISTS room_key_player (
+  room_key_id INTEGER NOT NULL,
+  account_id INTEGER NOT NULL,
+  awarded_at TEXT NOT NULL,
+  PRIMARY KEY (room_key_id, account_id)
+  );
+
+-- "This player's keys" — the primary key only serves lookups that lead with the key.
+CREATE INDEX IF NOT EXISTS idx_room_key_player_account ON room_key_player (account_id);