v1.0.0: players table + migration from singleton account (ISS-105)

lib/db/localPlayer.ts

@@ -0,0 +1,23 @@
+import { eq } from 'drizzle-orm';
+import type { GameDb } from './client';
+import * as schema from './schema';
+
+// v1.0.0 (ISS-105): TEMPORARY single-player economy access — resolves the local player row so all
+// pre-multiplayer code keeps working while `account` is replaced by `players`. A later step
+// parameterizes these by playerId for real multiplayer; until then every read/write of the
+// singleton economy goes through this file and nowhere else.
+
+export const LOCAL_PLAYER = { id: 'local', provider: 'local', username: 'kamilkrzywda' } as const;
+
+export async function getLocalPlayer(inst: GameDb): Promise<schema.PlayerRow> {
+  const [row] = await inst.db.select().from(schema.players).where(eq(schema.players.id, LOCAL_PLAYER.id));
+  if (!row) throw new Error('local player row missing');
+  return row;
+}
+
+export async function updateLocalPlayerEconomy(
+  inst: GameDb,
+  patch: { cash?: number; reputation?: number },
+): Promise<void> {
+  await inst.db.update(schema.players).set(patch).where(eq(schema.players.id, LOCAL_PLAYER.id));
+}