---
gsd_state_version: 1.0
milestone: v9.0
milestone_name: Rust-Native ClickHouse Writer
status: executing
stopped_at: Completed 37-01-PLAN.md
last_updated: "2026-03-29T11:37:35.689Z"
last_activity: 2026-03-29
progress:
  total_phases: 7
  completed_phases: 3
  total_plans: 9
  completed_plans: 8
---

# Project State

## Project Reference

See: .planning/PROJECT.md (updated 2026-03-28)

**Core value:** Zero-gap, zero-overlap bars across every restart, every boundary, every deploy.
**Current focus:** Phase 37 — Python Integration + Staging Validation

## Current Position

Phase: 37 (Python Integration + Staging Validation) — EXECUTING
Plan: 2 of 2
Status: Ready to execute
Last activity: 2026-03-29

## Performance Metrics

**Velocity:**

- Total plans completed: 0
- Average duration: --
- Total execution time: 0 hours

## Accumulated Context

### Decisions

- v7.3: Exchange gap classification shipped -- gaps now typed as pipeline vs exchange
- v8.0: DELETE spike (RESUME-04) comes first because it informs all other resume work
- v8.0: Backlog 999.2 (Aion-first defaults) promoted to Phase 31
- [Phase 29]: Extracted \_aion_delete_after_resume() to delete_strategy.py with batch pre-check query per symbol
- [Phase 29]: Exchange gap floor: clamp resume TID above permanent exchange gaps using kintsugi_log query, non-fatal on failure
- [Phase 30]: Conservative seed TID: min(last_completed_bar_tid) across thresholds for Parquet pre-fill
- [Phase 30]: Used Protocol type (\_HasMetrics) for engine parameter typing instead of Any
- [Phase 32]: 24 workers for bigblack bulk repair (ClickHouse bottleneck at higher values)
- [Phase 33]: Kept day-mode code behind guards for forex re-enablement; removed only unused params
- [Phase 34]: clickhouse-sink feature implies binance-integration (CompletedBar requires live_engine)
- [Phase 34]: Box<ClickHouseBarRow> in FlushCommand to avoid large enum variant
- [Phase 34]: Transient error classification via BadResponse string parsing (clickhouse crate abstracts HTTP)
- [Phase 34]: Raw reqwest POST replaces clickhouse crate INSERT for X-ClickHouse-Summary header access (WRITER-07)
- [Phase 35]: Niffler replay split into dedicated niffler.rs module to keep dead_letter.rs under 1000 lines
- [Phase 36]: ExtraSinks type alias pattern (Option<Arc<Mutex<...>>>) avoids cfg on function params
- [Phase 36]: dispatch_to_sinks() centralizes guard+fan-out, called from 3 emission paths
- [Phase 36]: No PyO3 binding changes for metrics bridge -- existing HashMap->PyDict conversion auto-exposes ch_writer_* keys
- [Phase 37]: Feature flag helpers in dedicated ch_writer_flag.py module (not __init__.py) per INIT-MONOLITH guard
- [Phase 37]: ch_writer_dead_letters_ok in CRITICAL_KEYS -- same severity as Python dead letters
- [Phase 37]: Shadow compare uses count+countDistinct(dedup_token) without FINAL for performance

### Pending Todos

None yet.

### Blockers/Concerns

- DELETE phase takes ~6 min for 42 partitions -- Phase 29 spike must find a strategy under 60s
- 98K historical day-boundary gaps healing at ~45/pass -- Phase 32 bulk reprocess needed
- Parquet tick cache available but not yet used by sidecar gap fill

## Session Continuity

Last session: 2026-03-29T11:37:35.687Z
Stopped at: Completed 37-01-PLAN.md
Resume file: None
