152 lines
3.6 KiB
Markdown
152 lines
3.6 KiB
Markdown
---
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id: state-hub-architecture
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title: "State Hub architecture"
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status: proposed
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owner: state-hub
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revision: "draft-2"
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version: "0.1"
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last_reviewed: "2026-08-19"
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review_interval: 6m
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---
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# State Hub — Software Architecture Documentation (arc42)
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## About this document
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First-wave arc42 for State Hub, the estate's live coordination
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read-model. This service is in active retirement planning; new
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permanent ownership should not land here. Chapter 9 points at the
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estate ADRs that still bind it.
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---
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## 1. Introduction and Goals
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State Hub is a queryable, auditable memory of work: domains, repos,
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workplans, tasks, decisions, progress. Files remain the origin. The
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hub is derived state (custodian ADR-001, ADR-003).
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It remains operational until retirement gates in
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`prj-state-hub-retirement` are met. Replacement ownership is moving
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toward `repo-manager` and `hub-core`.
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### 1.1 Requirements Overview
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- Rebuild coordination state from registered repository files.
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- One identifier registrar (ADR-007). This workstation is not it.
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- Preserve compatibility; do not take new permanent architectural
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ownership.
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### 1.2 Quality Goals
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1. Rebuildability from git.
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2. Hub never becomes the origin of work.
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3. Extraction paths stay open.
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### 1.3 Stakeholders
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| Role | Concern |
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| --- | --- |
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| state-hub | Live read-model during retirement. |
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| the-custodian | Estate rules the hub must not invert. |
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| repo-manager | Incoming consistency / repo representation. |
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| product repos | Workplan files the hub indexes. |
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---
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## 2. Architecture Constraints
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N/A for this stub — retirement program is the binding constraint.
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---
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## 3. System Scope and Context
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**In:** indexing workplans/tasks/decisions, consistency rebuild,
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query API and dashboard used today.
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**Out:** being the source of work items; new cross-domain capabilities;
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publication of policy (policy-nexus).
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### 3.1 Business Context
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Files are excellent for canon and provenance. The estate still needs a
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live query surface while retirement proceeds.
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### 3.2 Technical Context
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Inputs: workplan markdown via `fix-consistency`. Outputs: HTTP/MCP
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APIs. Neighbours: every registered repo, activity-core (ops runs),
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policy-nexus (does not index the hub).
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---
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## 4. Solution Strategy
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N/A for this stub. The strategy is already in the estate ADRs: files
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first, materialized derived state, single registrar, local cache vs
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authority (ADR-010, proposed).
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---
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## 5. Building Block View
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### 5.1 Level 1 – System/Top-Level
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N/A for this stub.
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---
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## 6. Runtime View
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N/A for this stub.
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---
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## 7. Deployment View
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N/A for this stub.
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---
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## 8. Cross-Cutting Concepts
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N/A for this stub.
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---
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## 9. Architecture Decisions
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This repo has no `docs/adr/` corpus. Binding decisions live in
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the-custodian and are listed on the estate map:
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| Estate ADR | Status | Why it binds this system |
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| --- | --- | --- |
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| `CUST-ADR-001` | accepted | Hub is a read model. Published `/adr/custodian-workplans-as-repo-artefacts/v1/`. |
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| `CUST-ADR-003` | accepted | How the cache invalidates. |
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| `CUST-ADR-007` | accepted | One writer of workplan UUIDs. |
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| `CUST-ADR-010` | proposed | Two kinds of hub data. |
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Do not treat a State Hub `/decisions` row as the published ADR.
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---
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## 10. Quality Requirements
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N/A for this stub.
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---
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## 11. Risks and Technical Debt
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N/A for this stub. Residual: this workstation cannot mint registrar
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UUIDs.
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---
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## 12. Glossary
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| Term | Meaning |
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| --- | --- |
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| Read model | Derived index; never the origin. |
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| Registrar | The single instance allowed to mint workplan UUIDs. |
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| Retirement | Coordinated move of capabilities out of this repo. |
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