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hub/tasks/architecture/storage/specify-payload-truncation.md
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---
id: specify-payload-truncation
name: Specify Call Graph Payload Truncation Details
status: completed
depends_on: [document-payload-redaction]
scope: narrow
risk: low
impact: isolated
level: implementation
---
## Description
W18: The truncation strategy says "truncate payloads larger than 10KB" but doesn't specify: when truncation happens (on write? after call completes?), what `preview` contains (first N bytes? N characters?), whether 10KB is configurable, or how object storage reference URLs are structured.
Specify: (a) truncation happens on write to DB (in-flight calls have full payloads); (b) `preview` is the first 1024 bytes of the JSON-serialized payload; (c) threshold is configurable per operation type or via hub config; (d) defer object storage details but add a placeholder section.
## Acceptance Criteria
- [ ] `call-graph.md` specifies truncation timing: on DB write, not in-flight
- [ ] `preview` field defined: first 1024 bytes of JSON-serialized payload
- [ ] 10KB threshold documented as configurable (hub config or per-operation-type)
- [ ] Placeholder section for object storage reference (deferred)
- [ ] Cross-reference to redaction strategy (this task depends on W08 resolution)
## References
- docs/reviews/storage-architecture-review-2026-04-21.md#W18
- docs/architecture/storage/call-graph.md:30
## Notes
> To be filled by implementation agent
## Summary
> To be filled on completion