Task list hierarchy

[suraj-yadav0]

This pull request introduces several improvements to data integrity, orphan record cleanup, and account scoping throughout the codebase. The main themes are: improved deletion and maintenance routines to prevent orphan data, stricter account scoping in queries, enhanced child task lookups, and a more robust notification daemon bootstrap process.

Database integrity and orphan data cleanup:

• Added post-deletion sweeps in deleteAccountAndRelatedData to remove orphaned records, and improved logging and error handling. [1] [2]
• Introduced a new cleanupOrphanAccountData function, called during post-startup maintenance in dbinit.js, to purge records with invalid account_id references from all major tables. [1] [2]

Account scoping and query improvements:

• Updated queries in project.js to always filter by valid account_id (i.e., those present in users), preventing orphaned or invalid data from being returned in project and update listings. [1] [2] [3] [4] [5]

Task and subtask handling:

• Refactored getChildTasks to require and use account_id for child lookups, ensuring tasks are only checked within the correct account. Updated all relevant callers. [1] [2] [3] [4] [5] [6]
• Added a new getSubtasksForParent utility for retrieving subtasks scoped by account and project, with color and timesheet aggregation.

Notification daemon robustness:

• Improved the notification daemon bootstrap logic to detect and update outdated systemd service files, ensuring the correct path is always used. [1] [2]

These changes collectively improve data consistency, prevent orphaned records, and ensure that all data access and manipulation is correctly scoped to existing accounts.