Fix: Encode Response body as JSON string in _watch endpoint

bin/routes/auth_routes.dart

@@ -30,6 +30,7 @@ class AuthRoutes {
     final user = await database.findUserByLogin(login);
 
     if (user == null || !BCrypt.checkpw(password, user.pwdHash)) {
+      await database.createLog(login, 'Failed login attempt');
       return Response(401, body: 'Invalid credentials');
     }
 
@@ -42,6 +43,7 @@ class AuthRoutes {
     );
     final token = jwt.sign(SecretKey(secret));
 
+    await database.createLog(login, 'Successful login');
     return Response(200, body: jsonEncode({
       'user': user.toMap(),
       'token': token
@@ -56,22 +58,26 @@ class AuthRoutes {
     final password = data['password'];
 
     final user = await database.createUser(login, password);
+    await database.createLog(login, 'User registration');
     return Response(201, body: jsonEncode(user.toMap()));
   }
 
-  Future<Response> _watch(Request request) async {
+  Future<Response> _watch(Request request, String login) async {
     final uniqueId = request.url.queryParameters['unique_id'];
 
     if (!database.isValidShareId(uniqueId!)) {
+      await database.createLog(login, 'Accessed invalid share link');
       return Response(404, body: 'Share link not found');
     }
 
     final position = await database.getLatestPosition();
 
     if (position == null) {
+      await database.createLog(login, 'Accessed share link - no position');
       return Response(404, body: 'No position available');
     }
 
-    return Response(200, body: position.toJson());
+    await database.createLog(login, 'Accessed share link');
+    return Response(200, body: jsonEncode(position.toJson()));
   }
 }