V0.7.1 New user online and pin features

backend/src/models/db.js

@@ -207,6 +207,22 @@ function initDb() {
     console.log('[DB] Migration: user_group_names table ready');
   } catch (e) { console.error('[DB] user_group_names migration error:', e.message); }
 
+  // Migration: pinned direct messages (per-user, up to 5)
+  try {
+    db.exec(`
+      CREATE TABLE IF NOT EXISTS pinned_direct_messages (
+        user_id   INTEGER NOT NULL,
+        group_id  INTEGER NOT NULL,
+        pinned_at TEXT NOT NULL DEFAULT (datetime('now')),
+        pin_order INTEGER NOT NULL DEFAULT 0,
+        PRIMARY KEY (user_id, group_id),
+        FOREIGN KEY (user_id) REFERENCES users(id) ON DELETE CASCADE,
+        FOREIGN KEY (group_id) REFERENCES groups(id) ON DELETE CASCADE
+      )
+    `);
+    console.log('[DB] Migration: pinned_direct_messages table ready');
+  } catch (e) { console.error('[DB] pinned_direct_messages migration error:', e.message); }
+
   console.log('[DB] Schema initialized');
   return db;
 }