add currency, outfits

apps/econ/migrations/0001_balance.sql

@@ -0,0 +1,15 @@
+-- Currency balances, owned by the `econ` worker. One row per (account, currency):
+-- the amount is a real INTEGER column, not a JSON field, so the spend path can be a
+-- single atomic `UPDATE ... WHERE amount >= ?` instead of a racy read-modify-write.
+--
+-- Only account-scoped currencies live here. RoomCurrency (300) / RoomInventoryItem
+-- (301) are scoped to a room and belong to the room-currency endpoints — a row here
+-- couldn't say which room it was for. Kept in sync with BALANCE_SCHEMA_DDL in
+-- src/balance-db.ts.
+
+CREATE TABLE IF NOT EXISTS balance (
+  account_id INTEGER NOT NULL,
+  currency_type INTEGER NOT NULL,
+  amount INTEGER NOT NULL DEFAULT 0,
+  PRIMARY KEY (account_id, currency_type)
+  );