fix: verify session belongs to expected account before using

- Add _verify_session() to check profile exists after loading session
- Skip session files from wrong accounts
- Clear cookies before trying next auth method

instagram_monitor.py

@@ -52,8 +52,13 @@ class InstagramMonitor:
             if session_path.exists():
                 try:
                     self.loader.load_session_from_file(config.instagram_username, str(session_path))
-                    logger.info(f"Session loaded from {session_path}")
-                    return True
+                    # Verify session belongs to the right account
+                    if self._verify_session():
+                        logger.info(f"Session loaded from {session_path}")
+                        return True
+                    else:
+                        logger.warning(f"Session from {session_path} belongs to wrong account, skipping")
+                        self._reset_session()
                 except Exception as e:
                     logger.warning(f"Session file {session_path} invalid: {e}")
 
@@ -134,6 +139,20 @@ class InstagramMonitor:
         # Verify session works
         instaloader.Profile.from_username(self.loader.context, config.instagram_username)
 
+    def _verify_session(self) -> bool:
+        """Check if loaded session belongs to the expected account."""
+        try:
+            profile = instaloader.Profile.from_username(self.loader.context, config.instagram_username)
+            return True
+        except instaloader.exceptions.ProfileNotExistsException:
+            return False
+        except Exception:
+            return False
+
+    def _reset_session(self) -> None:
+        """Clear session cookies to start fresh."""
+        self.loader.context._session.cookies.clear()
+
     def _load_cookies_from_json(self, path: Path) -> None:
         with open(path) as f:
             cookies = json.load(f)