# Read-Only Mode and Maintenance Window — OpsDeploy

<details>
  <summary><strong>🧭 Quick Return to Map</strong></summary>

<br>

  > You are in a sub-page of **OpsDeploy**.  
  > To reorient, go back here:  
  >
  > - [**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)  
  >
  > Think of this page as a desk within a ward.  
  > If you need the full triage and all prescriptions, return to the Emergency Room lobby.
</details>


Freeze writes quickly and communicate clearly during incidents, migrations, or index rebuilds. Keep retrieval online while protecting data integrity and user trust.

## Open these first
- Ordering and cold boots: [Bootstrap Ordering](https://github.com/onestardao/WFGY/blob/main/ProblemMap/bootstrap-ordering.md), [Pre-Deploy Collapse](https://github.com/onestardao/WFGY/blob/main/ProblemMap/predeploy-collapse.md)
- Idempotency and dedupe: [Idempotency & Dedupe](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/idempotency_dedupe.md)
- Incident comms: [Incident Comms & Statuspage](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/incident_comms_and_statuspage.md)
- Cache and warmup: [Cache Warmup & Invalidation](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/cache_warmup_invalidation.md)

## Acceptance targets
- All write endpoints return 423 or 503 with `Retry-After`
- No production writes in storage audit during the window
- Read paths healthy: error budget unaffected
- Banner or Statuspage posted before and after with exact times
- ΔS and λ trends flat during the window for read requests

## 60-second checklist
1) **Flip read-only flag**  
   Global feature flag `read_only=true`. Middleware blocks writes, tool calls that mutate state, and ingestion jobs.
2) **Communicate**  
   Post Statuspage and in-product banner with start and end times. Include contact and rollback plan.
3) **Queue writes**  
   Buffer allowed write intents to a durable queue with idempotency keys. Drop non-critical writes.
4) **Headers**  
   Write endpoints respond with `Retry-After: <seconds>` and a stable error code for clients to respect.
5) **Drains**  
   Stop background writers, disable compaction and long migrations during the window.

## Minimal playbook
- **Scope**: enumerate write surfaces including embeddings backfills, vector upserts, tool call side effects, KV mutations.  
- **Guard**: enforce in API gateway and service layer. Return machine-readable errors.  
- **Observe**: track blocked write count, queue depth, read latency, ΔS and λ.  
- **End**: re-enable writes, run a short soak, publish closure notice, then backfill the queued intents.

## Common pitfalls → fix
- A background job keeps writing  
  → include job scheduler in the flag check and stop crons.  
- Clients spin on retries  
  → add jittered backoff and a max-retry budget. See [Retry Backoff](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/retry_backoff.md).  
- Cached stale banners  
  → set short TTL and purge caches on start and end.

## Escalate
If read errors or ΔS spikes appear, extend the window and execute a limited [Rollback & Fast Recovery](https://github.com/onestardao/WFGY/blob/main/ProblemMap/GlobalFixMap/OpsDeploy/rollback_and_fast_recovery.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 + \<your question>” |
| **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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### Explore More

| Layer | Page | What it’s for |
| --- | --- | --- |
| Proof | [WFGY Recognition Map](/recognition/README.md) | External citations, integrations, and ecosystem proof |
| Engine | [WFGY 1.0](/legacy/README.md) | Original PDF based tension engine |
| Engine | [WFGY 2.0](/core/README.md) | Production tension kernel and math engine for RAG and agents |
| Engine | [WFGY 3.0](/TensionUniverse/EventHorizon/README.md) | TXT based Singularity tension engine, 131 S class set |
| Map | [Problem Map 1.0](/ProblemMap/README.md) | Flagship 16 problem RAG failure checklist and fix map |
| Map | [Problem Map 2.0](/ProblemMap/rag-architecture-and-recovery.md) | RAG focused recovery pipeline |
| Map | [Problem Map 3.0](/ProblemMap/wfgy-rag-16-problem-map-global-debug-card.md) | Global Debug Card, image as a debug protocol layer |
| Map | [Semantic Clinic](/ProblemMap/SemanticClinicIndex.md) | Symptom to family to exact fix |
| Map | [Grandma’s Clinic](/ProblemMap/GrandmaClinic/README.md) | Plain language stories mapped to Problem Map 1.0 |
| Onboarding | [Starter Village](/StarterVillage/README.md) | Guided tour for newcomers |
| App | [TXT OS](/OS/README.md) | TXT semantic OS, fast boot |
| App | [Blah Blah Blah](/OS/BlahBlahBlah/README.md) | Abstract and paradox Q and A built on TXT OS |
| App | [Blur Blur Blur](/OS/BlurBlurBlur/README.md) | Text to image with semantic control |
| App | [Blow Blow Blow](/OS/BlowBlowBlow/README.md) | Reasoning game engine and memory demo |

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