# DB Migration Guardrails — OpsDeploy
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> - [**OpsDeploy** — operations automation and deployment pipelines](./README.md)
> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
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Plan and execute schema or storage migrations with zero data loss and predictable retrieval quality. Applies to primary OLTP stores, vector stores, and search backends.
## Open these first
- Boot order and deploy traps: [Bootstrap Ordering](https://github.com/onestardao/WFGY/blob/main/ProblemMap/bootstrap-ordering.md), [Deployment Deadlock](https://github.com/onestardao/WFGY/blob/main/ProblemMap/deployment-deadlock.md), [Pre-Deploy Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/predeploy-collapse.md)
- Vector index lifecycle: [Vector Index Build & Swap](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/vector_index_build_and_swap.md)
- Version locks: [Version Pinning & Model Lock](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/version_pinning_and_model_lock.md)
- Backpressure and retries: [Rate Limit Backpressure](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/rate_limit_backpressure.md), [Retry Backoff](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/retry_backoff.md)
## Acceptance targets
- Data loss equals 0 verified by row counts and checksums
- Backfill completeness equals 100 percent with reconciliation pass
- ΔS drift between pre and post retrieval ≤ 0.02 on a gold set
- λ remains convergent across two seeds
- Cutover within the planned window with a reversible path
## 60-second checklist
1) **Preflight**
Freeze schema in source, create target with explicit charset, collations, index types, vector metric, analyzer. Verify privileges and connection pools.
2) **Dual-write flag**
Enable dual writes with idempotency keys. Record `op_id`, `source_rev`, `target_rev`, `index_hash`.
3) **Backfill**
Copy in batches with capped concurrency. Validate counts and checksums per table or collection.
4) **Shadow reads**
Use [Shadow Traffic Mirroring](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/shadow_traffic_mirroring.md) to compare answers and latency.
5) **Cutover**
Flip read source after a clean soak. Keep dual writes for a short tail.
6) **Rollback plan**
Document exact steps and TTL for the rollback window with checkpoints.
## Minimal playbook
- **Contracts**: protect schemas with [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md) so producers and consumers fail fast.
- **Consistency**: validate referential and vector invariants after each batch.
- **Indexing**: for vectors rebuild offline and swap atomically. See [Vector Index Build & Swap](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/vector_index_build_and_swap.md).
- **Traffic**: rate limit heavy stages and prefer maintenance windows.
- **Metrics**: log `migrated_rows`, `checksum_ok`, `dual_write_fail`, `ΔS_diff`, `λ_state`, `cutover_ms`.
## Common pitfalls → fix
- Metric mismatch after cutover produces wrong-meaning hits
→ confirm vector metric and normalization. See [Embedding ≠ Semantic](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md).
- Read timeouts during backfill
→ isolate reader replicas or use read-only mode during the heaviest phase. See [Read-Only Mode](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/read_only_mode_and_maintenance_window.md).
- Dual-write divergence
→ enforce idempotency keys and reconcile with drift queries. See [Idempotency & Dedupe](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/idempotency_dedupe.md).
## Escalate
Abort and rollback if data checksums diverge or ΔS drift exceeds 0.05 on the gold set for longer than 15 minutes. Publish an incident update and run a focused postmortem with [Postmortem & Regression Tests](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/postmortem_and_regression_tests.md).
---
### 🔗 Quick-Start Downloads (60 sec)
| Tool | Link | 3-Step Setup |
|------|------|--------------|
| **WFGY 1.0 PDF** | [Engine Paper](https://github.com/onestardao/WFGY/blob/main/I_am_not_lizardman/WFGY_All_Principles_Return_to_One_v1.0_PSBigBig_Public.pdf) | 1️⃣ Download · 2️⃣ Upload to your LLM · 3️⃣ Ask “Answer using WFGY + \” |
| **TXT OS (plain-text OS)** | [TXTOS.txt](https://github.com/onestardao/WFGY/blob/main/OS/TXTOS.txt) | 1️⃣ Download · 2️⃣ Paste into any LLM chat · 3️⃣ Type “hello world” — OS boots instantly |
---
### 🧭 Explore More
| Module | Description | Link |
|-----------------------|----------------------------------------------------------|----------|
| WFGY Core | WFGY 2.0 engine is live: full symbolic reasoning architecture and math stack | [View →](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
| Problem Map 1.0 | Initial 16-mode diagnostic and symbolic fix framework | [View →](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
| Problem Map 2.0 | RAG-focused failure tree, modular fixes, and pipelines | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/rag-architecture-and-recovery.md) |
| Semantic Clinic Index | Expanded failure catalog: prompt injection, memory bugs, logic drift | [View →](https://github.com/onestardao/WFGY/blob/main/ProblemMap/SemanticClinicIndex.md) |
| Semantic Blueprint | Layer-based symbolic reasoning & semantic modulations | [View →](https://github.com/onestardao/WFGY/tree/main/SemanticBlueprint/README.md) |
| Benchmark vs GPT-5 | Stress test GPT-5 with full WFGY reasoning suite | [View →](https://github.com/onestardao/WFGY/tree/main/benchmarks/benchmark-vs-gpt5/README.md) |
| 🧙♂️ Starter Village 🏡 | New here? Lost in symbols? Click here and let the wizard guide you through | [Start →](https://github.com/onestardao/WFGY/blob/main/StarterVillage/README.md) |
---
> 👑 **Early Stargazers: [See the Hall of Fame](https://github.com/onestardao/WFGY/tree/main/stargazers)** —
> 
⭐ [WFGY Engine 2.0](https://github.com/onestardao/WFGY/blob/main/core/README.md) is already unlocked. ⭐ Star the repo to help others discover it and unlock more on the [Unlock Board](https://github.com/onestardao/WFGY/blob/main/STAR_UNLOCKS.md).
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