Ver1 Step4 implementation plan

2026-06-26 14:37:30 -05:00
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+# Ver1 Step 4 Results: Data Model and Migration Safety
+
+## Summary
+
+Step 4 implementation status: **in progress**.
+
+This document records completed migration-safety work, validation evidence, and remaining follow-ups for Ver1 Step 4.
+
+Implemented in this step:
+
+1. _TBD_
+2. _TBD_
+3. _TBD_
+
+---
+
+## Implemented Changes
+
+### 1) Schema audit and invariant lock
+
+_TBD_
+
+### 2) Migration policy/tooling lock
+
+_TBD_
+
+### 3) Forward migration implementation
+
+_TBD_
+
+### 4) Rollback and mitigation runbook
+
+_TBD_
+
+### 5) Backfill implementation or explicit no-backfill decision
+
+_TBD_
+
+---
+
+## Test and Verification Evidence
+
+### Added/Updated Tests
+
+1. _TBD_
+2. _TBD_
+3. _TBD_
+
+### Validation Runs
+
+Run and record outcomes:
+
+- `uv run pytest --collect-only -q` -> _TBD_
+- `uv run pytest -m unit -q` -> _TBD_
+- `uv run pytest -m "not external" -q` -> _TBD_
+- `uv run pytest -q` -> _TBD_
+
+### Migration Rehearsal Evidence
+
+Record migration rehearsal details:
+
+- baseline data set used: _TBD_
+- forward migration result: _TBD_
+- post-migration verification result: _TBD_
+- rollback/mitigation rehearsal result: _TBD_
+
+---
+
+## Requirement Traceability (Step 4)
+
+| Step 4 Area | REQ Coverage | Status | Evidence |
+| --- | --- | --- | --- |
+| Schema lifecycle and state persistence safety | REQ-3, REQ-4, REQ-11 | _TBD_ | _TBD_ |
+| Lifespan/runtime ownership continuity | REQ-7 | _TBD_ | _TBD_ |
+| Explicit non-mutating production startup policy | REQ-10 | _TBD_ | _TBD_ |
+| Prompt/data continuity constraints | REQ-12 | _TBD_ | _TBD_ |
+
+---
+
+## Operational Artifacts Produced
+
+- `docs/ver1/ver1-step4.md`
+- `docs/ver1/ver1-step4-migration-runbook.md` (_if created_)
+- _TBD additional artifacts_
+
+---
+
+## Risks, Exceptions, and Follow-Ups
+
+1. _TBD_
+2. _TBD_
+3. _TBD_
+
+Open follow-ups to carry forward:
+
+- _TBD_
+
+---
+
+## Step 4 Exit Assessment
+
+- Schema validation against finalized V1 domain: **_TBD_**
+- Forward migration path safety and repeatability: **_TBD_**
+- Rollback/mitigation readiness: **_TBD_**
+- Backfill risk closure: **_TBD_**
+- Test and regression safety: **_TBD_**
+
+Step 4 completion status: **_TBD_**
+
+---
+
+## Handoff to Step 5
+
+Once Step 4 is marked complete, Step 5 can proceed with:
+
+- verified migration safety baseline
+- explicit rollback and recovery procedures
+- reduced data-integrity risk entering private-network safety hardening