- Modified SQL queries in multiple functions to set runner_id to NULL when updating task statuses for cancelled jobs and failed tasks.
- Ensured that tasks are properly marked as failed with the correct error messages and updated completion timestamps.
- Improved handling of task statuses to prevent potential issues with task assignment and execution.
- Removed redundant error handling in handleListJobTasks.
- Introduced per-job mutexes in Manager to serialize updateJobStatusFromTasks calls, ensuring thread safety during concurrent task completions.
- Added methods to manage job status update mutexes, including creation and cleanup after job completion or failure.
- Improved error handling in handleGetJobStatusForRunner by consolidating error checks.
