- Replaced direct SQLite connection calls with a context manager in various modules to ensure proper resource management and prevent file descriptor leaks.
- Introduced a new `connection` method in `DBManager` to standardize connection handling.
- Updated all relevant database interactions in modules such as `feed_manager`, `scheduler`, `commands`, and others to utilize the new connection method.
- Improved code readability and maintainability by consolidating connection logic.
- Added assertions to ensure call arguments are not None in multiple command tests.
- Introduced a new test for the CmdCommand class to verify that long command lists are truncated correctly with a '(N more)' suffix, improving command list readability.
