This pull request introduces several improvements and minor fixes across the codebase, focusing on dependency management, resource cleanup, and import handling. The most notable changes are grouped below.

Dependency and Environment Configuration:

• Added explicit python-version: "3.12" to the Qodana linter configuration in qodana.yaml to ensure consistent linting and compatibility across environments.

Resource Management and Cleanup:

• Improved resource cleanup in backend/openmlr/tools/compute_tools.py by ensuring that the SandboxManager (sm) is always defined and properly destroyed in error cases during the _handle_probe function. [1] [2]

Code Quality and Import Handling:

• Updated import logic in backend/openmlr/services/session_manager.py to use absolute imports for database operations, improving code clarity and maintainability.

Testing Improvements:

• Cleaned up unreachable code in the test_cancelled_returns_none test by removing a dead code path in the mock stream generator.