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Joshen Lim
ded5bc525b
## Context One for Database Connections - allow a user to view the root blocking queries Adds an additional filter button here that toggles the view <img width="738" height="142" alt="image" src="https://github.com/user-attachments/assets/9fea17ba-c6f6-419d-8847-47dba67fc00a" /> When toggled, will render a list of the _root_ blocking queries - these are queries that are at the end of the blocking chain (or otherwise the problematic ones causing other queries to be blocked) <img width="964" height="420" alt="image" src="https://github.com/user-attachments/assets/5300f523-6abe-49b6-92d0-7e16bbddd291" /> Within this view - you can expand the row to view the blocking chain <img width="950" height="335" alt="image" src="https://github.com/user-attachments/assets/bb07095a-3841-4db6-8959-ac2bb264ebf6" /> ## Other changes involved - Realised that "Top blocker" overview metric card logic is incorrect - Was previously naively checking the length of the `blocked_by` array, but it should be consider the nested chain length instead, so this PR fixes that <img width="364" height="108" alt="image" src="https://github.com/user-attachments/assets/89beccef-f6f0-43d1-9dcf-fc35958b09e5" /> - Clicking the PID if highlighted on a metric card will not scroll to the PID if it's already selected. This PR fixes that <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **New Features** * Added a **Root blockers** view to highlight sessions that block others, with expandable blocking chains revealing related waiting activity. * **Bug Fixes** * Updated blocking metrics to use **transitive** blocker counts and improved cycle protection and behavior when activity records are missing. * The blockers view now consistently affects state/application/role quantities, and **reset filters** clears the view. * **Refactor / UI** * Improved the sessions table with grouped/nested rows, clearer waiting indicators, and more consistent expand/collapse behavior. * **Tests** * Expanded coverage for blocking/waiting chain traversal and branching scenarios. <!-- end of auto-generated comment: release notes by coderabbit.ai -->