Fix test coverage gaps: unused imports, mock unix socket init, and cleanup

[Copilot]

• Remove unused patch import from tests/test_func.py
• Fix test_initialize_unix_socket_connection to actually exercise unix-socket initialization
• Add asyncTearDown to tests/test_edge_cases.py for proper cleanup
• Address code review nitpicks (better naming and exception comments)
• Fix tearDown to actually run by removing manual cleanup in tests
• Make db assertion less brittle by accepting numeric values

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