first commit

backend/src/stores/dataStore.js

@@ -0,0 +1,22 @@
+import { db }           from "../db.js";
+import { INITIAL_DATA } from "../constants/initialData.js";
+
+export const dataStore = {
+  async load(userId) {
+    const { rows } = await db.query("SELECT data FROM user_data WHERE user_id = $1", [userId]);
+    return rows[0] ? JSON.parse(rows[0].data) : structuredClone(INITIAL_DATA);
+  },
+  async save(userId, payload) {
+    await db.query(
+      "INSERT INTO user_data (user_id, data) VALUES ($1, $2) ON CONFLICT (user_id) DO UPDATE SET data = $2",
+      [userId, JSON.stringify(payload)]
+    );
+    return payload;
+  },
+  async reset(userId) {
+    await db.query(
+      "INSERT INTO user_data (user_id, data) VALUES ($1, $2) ON CONFLICT (user_id) DO UPDATE SET data = $2",
+      [userId, JSON.stringify(structuredClone(INITIAL_DATA))]
+    );
+  },
+};