---
gsd_state_version: 1.0
milestone: v6.0
milestone_name: Data Integrity & Checksum Verification
status: verifying
stopped_at: Completed 12-01-PLAN.md
last_updated: "2026-03-26T06:12:27.548Z"
last_activity: 2026-03-26
progress:
  total_phases: 13
  completed_phases: 7
  total_plans: 7
  completed_plans: 7
  percent: 70
---

# Project State

## Project Reference

See: .planning/PROJECT.md (updated 2026-03-25)

**Core value:** End-to-end SHA-256 checksum verification of all downloaded raw data with heartbeat telemetry.
**Current focus:** Phase 12 — telemetry-heartbeat

## Current Position

Phase: 999.1
Plan: Not started
Status: Phase complete — ready for verification
Last activity: 2026-03-26

Progress: [=======░░░] 70% (7/12 phases across all milestones, 0/5 in v6.0)

## Performance Metrics

**Velocity:**

- Total plans completed: 7 (v5.0/v5.1)
- Average duration: 3.7 min
- Total execution time: ~0.4 hours

**By Phase (v5.0/v5.1):**

| Phase        | Plans | Total | Avg/Plan |
| ------------ | ----- | ----- | -------- |
| Phase 01 P01 | 1     | 4min  | 4min     |
| Phase 02 P01 | 1     | 3min  | 3min     |
| Phase 03 P01 | 1     | 6min  | 6min     |
| Phase 04 P01 | 1     | 5min  | 5min     |
| Phase 05 P01 | 1     | 2min  | 2min     |
| Phase 06 P01 | 1     | 4min  | 4min     |
| Phase 07 P01 | 1     | 2min  | 2min     |

**Recent Trend:**

- Last 5 plans: 2min, 5min, 6min, 4min, 2min
- Trend: Stable

_Updated after each plan completion_
| Phase 08 P01 | 6min | 3 tasks | 4 files |
| Phase 09 P01 | 3min | 1 tasks | 2 files |
| Phase 10 P01 | 6min | 1 tasks | 2 files |
| Phase 11 P01 | 4min | 1 tasks | 2 files |
| Phase 12-telemetry-heartbeat P01 | 4min | 3 tasks | 7 files |

## Accumulated Context

### Decisions

Decisions are logged in PROJECT.md Key Decisions table.
Recent decisions affecting current work:

- v6.0: SPIKE must be Phase 8 -- proves Rust checksum works from Python before wiring into seeder
- v6.0: TELEM-03 (registry) is Phase 9 -- foundation that seeder and sweep both depend on
- v6.0: Phase 11 (sweep) depends only on registry, not on seeder -- can parallelize with Phase 10 if needed
- [Phase 08]: SPIKE-02 overhead 13.5% accepted -- HTTP round-trip bottleneck, not SHA-256; acceptable for background seeder on bigblack
- [Phase 09]: Keyed by {symbol}:{date} for O(1) upsert and lookup
- [Phase 10]: Soft-skip on 404/timeout CHECKSUM (old data may not have checksums)
- [Phase 10]: Batch registry save after thread pool (not per-file) to reduce I/O
- [Phase 11]: Sweep downloads original Vision ZIPs (not local Parquet) because CHECKSUMs are computed against ZIP bytes
- [Phase 12-telemetry-heartbeat]: checksum_ok in CRITICAL_KEYS (LOUD) -- corrupted data warrants immediate alert

### From Previous Milestones

- Writer ownership: sidecar owns today, kintsugi owns yesterday+older
- Kintsugi is Parquet-only (v2.0), seeder is sole REST owner
- Combined WS (2x9 hybrid) shipped in v3.0
- All timestamps microsecond, column names `_us` (v4.0)
- Heartbeat uses exception-only pattern (v5.1 Phase 7)

### Pending Todos

None yet.

### Blockers/Concerns

None yet.

### Quick Tasks Completed

| #          | Description                                                | Date       | Commit  | Directory                                                                                                           |
| ---------- | ---------------------------------------------------------- | ---------- | ------- | ------------------------------------------------------------------------------------------------------------------- |
| 260325-fij | Update odb-ship to guarantee healthy heartbeat post-deploy | 2026-03-25 | 02ef077 | [260325-fij-update-odb-ship-to-guarantee-healthy-hea](./quick/260325-fij-update-odb-ship-to-guarantee-healthy-hea/) |

## Session Continuity

Last session: 2026-03-26T06:03:49.352Z
Stopped at: Completed 12-01-PLAN.md
Resume file: None
