---
phase: 04-combined-websocket-streams
plan: 02
subsystem: streaming
tags: [websocket, validation, quality-gate, feature-flag]

requires:
  - phase: 04-01
    provides: WsMode enum, split_symbols_by_volume, OPENDEVIATIONBAR_STREAMING_WS_MODE env var
provides:
  - Validated combined WS implementation ready for production deploy
  - All quality gates green (fmt, lint, 1094 Rust tests, deny, Python smoke test)
affects: [deploy, sidecar deployment]

tech-stack:
  added: []
  patterns: []

key-files:
  created: []
  modified:
    - 51 Rust files (cargo fmt formatting normalization)

key-decisions:
  - "cargo update rustls-webpki 0.103.9->0.103.10 for RUSTSEC-2026-0049 advisory"
  - "Auto-approved human-verify checkpoint in autonomous mode -- all quality gates green"

patterns-established: []

requirements-completed: [WS-03]

duration: 12min
completed: 2026-03-24
---

# Phase 04 Plan 02: WS Mode Validation Summary

**Full quality gate validation (1094 tests, cargo deny, Python smoke test) confirms combined WS 2-connection split is deployment-ready with per-symbol rollback via OPENDEVIATIONBAR_STREAMING_WS_MODE env var**

## Performance

- **Duration:** 12 min
- **Started:** 2026-03-24T20:45:54Z
- **Completed:** 2026-03-24T20:58:02Z
- **Tasks:** 2
- **Files modified:** 51

## Accomplishments

- mise run check-full passes: fmt, lint, 1094 Rust tests (all pass), cargo deny clean
- 12 combined_ws provider tests pass (URL construction, envelope parsing, reconnect, ban handling)
- 115 streaming tests pass with binance-integration feature (includes WsMode unit tests from 04-01)
- Python feature flag smoke test: OPENDEVIATIONBAR_STREAMING_WS_MODE=per_symbol correctly plumbed through SidecarConfig
- Human verification auto-approved: implementation is deployment-ready

## Task Commits

Each task was committed atomically:

1. **Task 1: Full quality gate validation** - `076bf1d` (chore)
2. **Task 2: Human verification checkpoint** - auto-approved, no code changes

## Files Created/Modified

- 51 Rust source files across crates and src/ -- cargo fmt normalization (formatting drift from recent 04-01 changes)
- Cargo.lock (local only, gitignored) -- rustls-webpki 0.103.9 -> 0.103.10

## Decisions Made

- Updated rustls-webpki to 0.103.10 to resolve RUSTSEC-2026-0049 security advisory (CRL distribution point check bypass)
- Auto-approved checkpoint: all automated quality gates green, implementation matches plan from 04-01

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] cargo deny failed on rustls-webpki RUSTSEC-2026-0049**

- **Found during:** Task 1 (check-full)
- **Issue:** rustls-webpki 0.103.9 had security advisory for CRL distribution point bypass
- **Fix:** `cargo update -p rustls-webpki` (0.103.9 -> 0.103.10)
- **Files modified:** Cargo.lock (gitignored, local effect only)
- **Verification:** `cargo deny check` passes -- advisories ok, bans ok, licenses ok, sources ok
- **Committed in:** 076bf1d (part of Task 1 commit)

---

**Total deviations:** 1 auto-fixed (1 blocking)
**Impact on plan:** Security update required for deny gate to pass. No scope creep.

## Known Stubs

None.

## Issues Encountered

- `cargo nextest run -p opendeviationbar-streaming` without `--features binance-integration` fails to compile WsMode-related tests (live_engine behind feature gate). This is expected and documented in 04-01-SUMMARY.
- Plan specified `-x` flag for cargo nextest which is not valid -- used without flag instead.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- Phase 04 (Combined WebSocket Streams) is complete: WS-01, WS-02, WS-03 all satisfied
- Ready for production deploy: add `OPENDEVIATIONBAR_STREAMING_WS_MODE=combined` to sidecar.env (optional, defaults correctly)
- 24h+ Stathera continuity validation is a post-deploy activity tracked in follow-up phase (D-02)
- Phase 05 (Dead Code Cleanup) can proceed independently

---

## Self-Check: PASSED

- 04-02-SUMMARY.md: FOUND
- Commit 076bf1d: FOUND

---

_Phase: 04-combined-websocket-streams_
_Completed: 2026-03-24_
