feat(analytics): implement learning analytics feature with data collection and display

server/config/database.js

@@ -768,6 +768,40 @@ export async function initDatabase() {
     await db.exec('ALTER TABLE users ADD COLUMN oauth_provider_id TEXT DEFAULT NULL');
   }
 
+  // ── Learning Analytics table ─────────────────────────────────────────────
+  if (!(await db.columnExists('rooms', 'learning_analytics'))) {
+    await db.exec('ALTER TABLE rooms ADD COLUMN learning_analytics INTEGER DEFAULT 0');
+  }
+
+  if (isPostgres) {
+    await db.exec(`
+      CREATE TABLE IF NOT EXISTS learning_analytics_data (
+        id SERIAL PRIMARY KEY,
+        room_id INTEGER NOT NULL REFERENCES rooms(id) ON DELETE CASCADE,
+        meeting_id TEXT NOT NULL,
+        meeting_name TEXT,
+        data JSONB NOT NULL,
+        created_at TIMESTAMP DEFAULT NOW()
+      );
+      CREATE INDEX IF NOT EXISTS idx_analytics_room_id ON learning_analytics_data(room_id);
+      CREATE INDEX IF NOT EXISTS idx_analytics_meeting_id ON learning_analytics_data(meeting_id);
+    `);
+  } else {
+    await db.exec(`
+      CREATE TABLE IF NOT EXISTS learning_analytics_data (
+        id INTEGER PRIMARY KEY AUTOINCREMENT,
+        room_id INTEGER NOT NULL,
+        meeting_id TEXT NOT NULL,
+        meeting_name TEXT,
+        data TEXT NOT NULL,
+        created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
+        FOREIGN KEY (room_id) REFERENCES rooms(id) ON DELETE CASCADE
+      );
+      CREATE INDEX IF NOT EXISTS idx_analytics_room_id ON learning_analytics_data(room_id);
+      CREATE INDEX IF NOT EXISTS idx_analytics_meeting_id ON learning_analytics_data(meeting_id);
+    `);
+  }
+
   // ── Default admin (only on very first start) ────────────────────────────
   const adminAlreadySeeded = await db.get("SELECT value FROM settings WHERE key = 'admin_seeded'");
   if (!adminAlreadySeeded) {