---
id: add-missing-indexes-observability
name: Add Missing Indexes — Call Graph & Observability Domain
status: completed
depends_on: [add-call-graph-edges-indexes-cascades]
scope: narrow
risk: low
impact: component
level: implementation
---

## Description

W03 (partial): Add missing indexes for call graph tables. These are closely related to C10 (call graph edges missing indexes and cascade documentation) — the cascade documentation should be resolved first, then indexes added here.

Missing indexes:
- `call_graph_nodes`: `idx_call_graph_nodes_created_at` on `(createdAt)` — time-range queries
- `call_graph_nodes`: `idx_call_graph_nodes_operation_created` on `(operationId, createdAt)` — operation + time queries
- `call_graph_edges`: `idx_call_graph_edges_source_id` on `(sourceId)` — graph traversal (children)
- `call_graph_edges`: `idx_call_graph_edges_target_id` on `(targetId)` — graph traversal (parents)

Note: The edge indexes are also called out in C10. This task focuses on adding them to the spec docs; C10's critical task resolves the cascade documentation and `parentRequestId` ambiguity.

## Acceptance Criteria

- [ ] `table-reference.md` indexes section includes all four call graph indexes
- [ ] `call-graph.md` per-domain doc references the new indexes
- [ ] Index purposes documented (graph traversal for edges, time-range/compound for nodes)
- [ ] Cross-reference to C10 resolution noted if cascade entries were already added

## References

- docs/reviews/storage-architecture-review-2026-04-21.md#W03
- docs/reviews/storage-architecture-review-2026-04-21.md#C10
- docs/architecture/storage/table-reference.md
- docs/architecture/storage/call-graph.md

## Notes

> To be filled by implementation agent

## Summary

> To be filled on completion