feat(db): add users/currency/bans/settings read repositories

packages/db/src/repositories/currency-repo.ts

@@ -0,0 +1,16 @@
+import { eq } from "drizzle-orm";
+import type { Database } from "../client.js";
+import { usersCurrency } from "../schema/users-currency.js";
+
+export function makeCurrencyRepo(db: Database) {
+  return {
+    // Returns a map of currency type -> amount for one user.
+    forUser: async (userId: number): Promise<Map<number, number>> => {
+      const rows = await db
+        .select()
+        .from(usersCurrency)
+        .where(eq(usersCurrency.userId, userId));
+      return new Map(rows.map((r) => [r.type, r.amount]));
+    },
+  };
+}