fix delete connection POST request

src/webssh_backend/database.py

@@ -208,8 +208,12 @@ class CredentialsManager:
                 "DELETE FROM connections WHERE id = ? AND username = ?",
                 (conn_id, username)
             )
+            deleted = cursor.rowcount
             conn.commit()
             conn.close()
+            if deleted != 1:
+                logger.warning(f"Connection {conn_id} not found for user {username}")
+                return False
             logger.info(f"Deleted connection {conn_id} for user {username}")
             return True
         except Exception as e: