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94 lines
6.1 KiB
Markdown
94 lines
6.1 KiB
Markdown
# DB Migration Guardrails — OpsDeploy
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<details>
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<summary><strong>🧭 Quick Return to Map</strong></summary>
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<br>
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> You are in a sub-page of **OpsDeploy**.
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> To reorient, go back here:
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>
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> - [**OpsDeploy** — operations automation and deployment pipelines](./README.md)
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> - [**WFGY Global Fix Map** — main Emergency Room, 300+ structured fixes](../README.md)
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> - [**WFGY Problem Map 1.0** — 16 reproducible failure modes](../../README.md)
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>
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> Think of this page as a desk within a ward.
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> If you need the full triage and all prescriptions, return to the Emergency Room lobby.
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</details>
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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.
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## Open these first
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- 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)
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- Vector index lifecycle: [Vector Index Build & Swap](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/vector_index_build_and_swap.md)
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- Version locks: [Version Pinning & Model Lock](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/version_pinning_and_model_lock.md)
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- 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)
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## Acceptance targets
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- Data loss equals 0 verified by row counts and checksums
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- Backfill completeness equals 100 percent with reconciliation pass
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- ΔS drift between pre and post retrieval ≤ 0.02 on a gold set
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- λ remains convergent across two seeds
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- Cutover within the planned window with a reversible path
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## 60-second checklist
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1) **Preflight**
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Freeze schema in source, create target with explicit charset, collations, index types, vector metric, analyzer. Verify privileges and connection pools.
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2) **Dual-write flag**
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Enable dual writes with idempotency keys. Record `op_id`, `source_rev`, `target_rev`, `index_hash`.
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3) **Backfill**
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Copy in batches with capped concurrency. Validate counts and checksums per table or collection.
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4) **Shadow reads**
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Use [Shadow Traffic Mirroring](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/shadow_traffic_mirroring.md) to compare answers and latency.
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5) **Cutover**
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Flip read source after a clean soak. Keep dual writes for a short tail.
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6) **Rollback plan**
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Document exact steps and TTL for the rollback window with checkpoints.
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## Minimal playbook
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- **Contracts**: protect schemas with [Data Contracts](https://github.com/onestardao/WFGY/blob/main/ProblemMap/data-contracts.md) so producers and consumers fail fast.
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- **Consistency**: validate referential and vector invariants after each batch.
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- **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).
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- **Traffic**: rate limit heavy stages and prefer maintenance windows.
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- **Metrics**: log `migrated_rows`, `checksum_ok`, `dual_write_fail`, `ΔS_diff`, `λ_state`, `cutover_ms`.
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## Common pitfalls → fix
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- Metric mismatch after cutover produces wrong-meaning hits
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→ confirm vector metric and normalization. See [Embedding ≠ Semantic](https://github.com/onestardao/WFGY/blob/main/ProblemMap/embedding-vs-semantic.md).
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- Read timeouts during backfill
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→ 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).
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- Dual-write divergence
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→ enforce idempotency keys and reconcile with drift queries. See [Idempotency & Dedupe](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/idempotency_dedupe.md).
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## Escalate
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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).
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---
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### 🔗 Quick-Start Downloads (60 sec)
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| Tool | Link | 3-Step Setup |
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|------|------|--------------|
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| **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 + \<your question>” |
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| **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 |
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---
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<!-- WFGY_FOOTER_START -->
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### Explore More
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| Module | Description | Link |
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| --- | --- | --- |
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| WFGY Core | Canonical framework entry point | [View](https://github.com/onestardao/WFGY/tree/main/core/README.md) |
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| Problem Map | Diagnostic map and navigation hub | [View](https://github.com/onestardao/WFGY/tree/main/ProblemMap/README.md) |
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| Tension Universe Experiments | MVP experiment field | [View](https://github.com/onestardao/WFGY/tree/main/TensionUniverse/Experiments) |
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| Recognition | Where WFGY is referenced or adopted | [View](https://github.com/onestardao/WFGY/blob/main/recognition/README.md) |
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| AI Guide | Anti-hallucination reading protocol for tools | [View](https://github.com/onestardao/WFGY/blob/main/AI_GUIDE.md) |
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> If this repository helps, starring it improves discovery for other builders.
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> [](https://github.com/onestardao/WFGY)
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<!-- WFGY_FOOTER_END -->
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