feat: display subagent sessions as collapsible tree with cost roll-up#360
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Persist parent-child session relationships (migration v26) and render subagent sessions as collapsible tree rows in all dashboard session tables. Parent rows show combined cost (own + children) and a toggle to expand/collapse child rows. - Add parent_session_id and is_subagent columns to session_state - Resolve x-parent-session-id header to Lore internal ID via headerSessionIndex - Persist isSubagent and parentSessionId immediately on detection - Restore parent-child relationships across gateway restarts - Build tree structure in buildLiveSessionRows() with cost roll-up - Render collapsible rows with toggle, indentation, and child count - Apply to all session tables: costs, warming, project detail pages
- Search full headerSessionIndex for parent resolution (not just Tier 1) - Re-attempt resolution on subsequent requests when parent is pending - Log warning when parent resolution fails (Tier 3 limitation) - Sort preserves parent-child row adjacency (treats tree as unit) - Filter respects tree structure (matching child shows parent) - Recursive cost roll-up and rendering for multi-level nesting - Deduplicate loadParentChildMap() calls (compute once per page) - Warming page stats include subagent children in counts - Replace unsafe 'as' cast with proper SessionState type import
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Summary
parent_session_id+is_subagentcolumns onsession_state)x-parent-session-idheader value to Lore internal session ID viaheaderSessionIndexlookup at detection time(+N subagents)indicator↳prefix and indentation on toggle clickFiles Changed
packages/core/src/db.tsloadParentChildMap()querypackages/core/src/index.tsloadParentChildMappackages/gateway/src/translate/types.tsparentSessionIdtoSessionStatepackages/gateway/src/pipeline.tspackages/gateway/src/ui.tspackages/core/test/db.test.tsHow to Test
/ui/costs— subagent sessions should appear nested under their parent with a ▶ toggle↳prefix/ui/warmingand/ui/projects/:idpages