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Jim Lancaster
2026-06-25 16:07:12 -05:00
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docs/adr/ADR-0001-lifespan-owned-runtime-resources.md
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# ADR-0001: Lifespan-owned runtime resources
- **Status:** accepted
- **Date:** 2026-06-25
## Context
MVP initialized core runtime resources (database engine and worker dependencies) through module-level globals and startup side effects. `REQ-7` requires lifespan-owned runtime resources with explicit ownership and cleanup.
## Decision
Adopt lifespan-owned runtime resource initialization in `transcription.app`:
1. Initialize database runtime during app lifespan startup.
2. Store runtime handles on `app.state`.
3. Pass runtime-owned dependencies (engine) to worker startup.
4. Dispose runtime resources explicitly during lifespan shutdown.
## Consequences
### Positive
- Explicit startup and shutdown ownership.
- Predictable cleanup ordering.
- Reduced hidden global side effects.
### Tradeoffs
- Minor wiring complexity in app startup.
- Some call-sites still support fallback lazy initialization for compatibility.
## Alternatives Considered
1. **Keep module-level global ownership**
- Rejected: conflicts with `REQ-7` and increases ambiguity.
2. **Introduce full async DB stack immediately**
- Rejected for Step 1: too broad for architecture-consolidation scope.
docs/adr/ADR-0002-explicit-schema-bootstrap-policy.md
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# ADR-0002: Explicit schema bootstrap policy
- **Status:** accepted
- **Date:** 2026-06-25
## Context
MVP called schema bootstrap (`create_all`) on every startup. `REQ-10` requires explicit, opt-in schema bootstrap behavior so normal production startup does not mutate schema.
## Decision
Add environment-aware bootstrap policy:
1. New settings:
- `environment`: `development` | `test` | `production`
- `bootstrap_schema_on_startup`: optional explicit override
2. Default behavior:
- Development/test: bootstrap enabled
- Production: bootstrap disabled
3. App startup calls `create_all` only when policy evaluates true.
## Consequences
### Positive
- Production startup behavior is safer and policy-driven.
- Local development remains simple by default.
### Tradeoffs
- Deployments now require explicit schema management in production.
## Alternatives Considered
1. **Always bootstrap in all environments**
- Rejected: violates `REQ-10` intent.
2. **Disable bootstrap everywhere immediately**
- Rejected: hurts local developer workflow without migration tool replacement yet.
docs/adr/ADR-0003-persistence-baseline-and-transition-path.md
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# ADR-0003: Persistence baseline and transition path
- **Status:** accepted
- **Date:** 2026-06-25
## Context
Architecture targets PostgreSQL baseline (optional MongoDB), while MVP currently runs on SQLite by default. V1 needs a clear transition path without destabilizing ongoing work.
## Decision
1. Preserve database URL configurability through centralized settings.
2. Keep SQLite functional for local dev/test and fast feedback.
3. Treat PostgreSQL as production baseline target for V1 completion.
4. Keep persistence access behind `transcription.db` runtime/session access points.
## Consequences
### Positive
- Clear migration path without immediate broad rewrite.
- Controlled risk while preserving velocity.
### Tradeoffs
- Temporary dual-path assumptions (SQLite local vs PostgreSQL target).
## Alternatives Considered
1. **Immediate forced PostgreSQL-only migration**
- Rejected: higher short-term disruption risk.
2. **Remain SQLite-only for V1**
- Rejected: inconsistent with architecture and requirement trajectory.
docs/adr/ADR-0004-in-process-worker-topology.md
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# ADR-0004: In-process worker topology for V1
- **Status:** accepted
- **Date:** 2026-06-25
## Context
The current system uses an in-process background worker. Architecture docs allow this in foundation stage and permit later hardening (optional external worker/queue).
## Decision
Retain in-process worker topology for V1, with improved lifecycle ownership:
1. Worker starts/stops via app lifespan.
2. Worker receives runtime-owned DB engine dependency explicitly.
3. Extension path to external worker remains behind existing service/adapter seams.
## Consequences
### Positive
- Keeps operational complexity low for personal-scale use.
- Preserves delivery focus on V1 completion.
### Tradeoffs
- Throughput/scaling limits remain compared to external queue-based topology.
## Alternatives Considered
1. **Immediate queue/external worker introduction**
- Rejected: premature complexity for current scale.
2. **Ad hoc thread lifecycle management outside lifespan**
- Rejected: weaker shutdown guarantees and poorer ownership clarity.
docs/adr/README.md
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# Architecture Decision Records (ADRs)
This directory records significant architecture decisions for Version 1.
## ADR Format
Each ADR should include:
1. **Status** (`proposed`, `accepted`, `superseded`)
2. **Context**
3. **Decision**
4. **Consequences**
5. **Alternatives Considered**
## Index
- [ADR-0001: Lifespan-owned runtime resources](ADR-0001-lifespan-owned-runtime-resources.md)
- [ADR-0002: Explicit schema bootstrap policy](ADR-0002-explicit-schema-bootstrap-policy.md)
- [ADR-0003: Persistence baseline and transition path](ADR-0003-persistence-baseline-and-transition-path.md)
- [ADR-0004: In-process worker topology for V1](ADR-0004-in-process-worker-topology.md)
docs/architecture.md
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Worker --> MG
```
## Runtime Ownership And Startup Policy (V1 Step 1)
The current implementation now uses explicit lifespan-owned runtime resources.
- application lifespan initializes and disposes database runtime resources
- worker lifecycle is owned by application lifespan startup/shutdown
- worker receives lifespan-owned database engine dependency explicitly
- schema bootstrap policy is environment-aware and explicit:
- development/test default to bootstrap enabled
- production defaults to bootstrap disabled
- explicit override is available via configuration
This aligns implementation toward REQ-7 and REQ-10 while preserving personal-scale operational simplicity.
## Layered Module Structure
### Interface Layer
@@ -121,7 +135,7 @@ Production transcription flow:
2. The application validates payloads and creates document and job records.
3. The in-process worker dequeues the job and calls the transcription provider.
4. The application persists transcript output, confidence metadata, and provenance events.
5. Job status transitions from queued to processing to completed or failed.
5. Job status transitions from queued to processing to transcribed or failed.
6. The UI and API expose status, revision history, and searchable transcript text.
## Data Model Ownership
@@ -253,7 +267,10 @@ Control:
## Related Pages
- [System overview](index.md)
- [Testing guide](tests.md)
- [Version 1 plan](ver1/ver1.md)
- [Version 1 Step 1 plan](ver1/ver1-step1.md)
- [Version 1 Step 1 results](ver1/ver1-step1-results.md)
- [Architecture decision records index](adr/README.md)
## Glossary
docs/index.md
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Read [architecture.md](architecture.md) first.
Then review [ver1/ver1.md](ver1/ver1.md) for completion scope and [ver1/ver1-step1-results.md](ver1/ver1-step1-results.md) for current architecture-consolidation status.
The architecture page is the primary technical reference and defines:
- deployed topology and infrastructure limits
@@ -40,7 +42,10 @@ This operating model keeps deployment and maintenance simple while preserving cl
## Documentation Map
- Architecture and technical design: [architecture.md](architecture.md)
- Testing strategy and guidance: [tests.md](tests.md)
- Version 1 implementation plan: [ver1/ver1.md](ver1/ver1.md)
- Version 1 Step 1 plan: [ver1/ver1-step1.md](ver1/ver1-step1.md)
- Version 1 Step 1 results: [ver1/ver1-step1-results.md](ver1/ver1-step1-results.md)
- Architecture decision records (ADR index): [adr/README.md](adr/README.md)
- Runtime and deployment requirements: [requirements.md](requirements.md)
- Error handling policy and operational guidance: [error_handling.md](error_handling.md)
- Domain context and transcription policy: [intent.md](intent.md)
docs/ver1/ver1-step1-results.md
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# Ver1 Step 1 Results: Architecture Consolidation
## Summary
Step 1 implementation has been completed for the primary architecture-consolidation objectives:
1. Lifespan-owned runtime resource model introduced for DB runtime ownership.
2. Schema bootstrap policy changed from implicit-always to explicit/environment-aware.
3. Worker startup now receives lifespan-owned DB engine dependency.
4. ADR set established for key V1 architectural decisions.
## Implemented Changes
### 1) Runtime ownership
- Updated `src/transcription/db.py`:
- Added `DatabaseRuntime` resource model.
- Added explicit runtime lifecycle methods:
- `initialize_database_runtime(...)`
- `get_database_runtime()`
- `dispose_database_runtime()`
- Updated `src/transcription/app.py`:
- Lifespan initializes DB runtime and stores it on `app.state`.
- Lifespan disposes DB runtime on shutdown.
### 2) Schema bootstrap policy (REQ-10 alignment)
- Updated `src/transcription/config.py`:
- Added `environment` setting (`development`, `test`, `production`).
- Added `bootstrap_schema_on_startup` explicit override setting.
- Updated `src/transcription/db.py`:
- Added `should_bootstrap_schema(settings)` policy function.
- Updated `src/transcription/app.py`:
- Startup now calls `create_all(...)` only when policy allows.
### 3) Worker dependency ownership
- Updated `src/transcription/worker.py`:
- `process_next_queued_job(..., engine=None)` now supports explicit engine injection.
- `run_worker_loop(..., engine=None, ...)` now supports explicit engine injection.
- Updated `src/transcription/app.py`:
- Worker thread is started with lifespan-owned engine.
### 4) ADR governance
Created:
- `docs/adr/README.md`
- `docs/adr/ADR-0001-lifespan-owned-runtime-resources.md`
- `docs/adr/ADR-0002-explicit-schema-bootstrap-policy.md`
- `docs/adr/ADR-0003-persistence-baseline-and-transition-path.md`
- `docs/adr/ADR-0004-in-process-worker-topology.md`
## Test Evidence
Targeted regression checks executed successfully:
- `uv run pytest tests/test_app.py tests/test_db.py tests/services/test_worker.py -q`
- Result: pass
## Residual Risks / Follow-ups
1. Full REQ-7 completion may still require broader runtime ownership coverage for additional resources as V1 expands.
2. Production schema management workflow (migrations/runbook tooling) should be finalized in subsequent V1 steps.
3. Additional boundary enforcement automation (import-lint style checks) can be added in later hardening.
## Step 1 Exit Assessment
- Architecture ownership clarity: **met**
- Schema bootstrap policy hardening: **met**
- Worker lifecycle dependency clarity: **met**
- ADR baseline established: **met**
## Completion Checklist With Evidence
| Criterion | Status | Evidence |
| --- | --- | --- |
| Architecture conformance matrix approved | partial | Consolidation implemented and documented in `docs/ver1/ver1-step1.md` + this results doc; formal matrix artifact can be added as a follow-up appendix. |
| REQ-7 ownership gaps resolved or explicitly deferred | met | Lifespan-owned DB runtime and explicit worker engine wiring implemented in `src/transcription/app.py`, `src/transcription/db.py`, `src/transcription/worker.py`. Residual scope documented under follow-ups. |
| REQ-10 explicit bootstrap policy implemented and verified | met | Policy implemented via `environment` + `bootstrap_schema_on_startup` in `src/transcription/config.py`, `should_bootstrap_schema(...)` in `src/transcription/db.py`, startup gate in `src/transcription/app.py`, tested in `tests/test_db.py`. |
| Dependency direction rules documented and enforced | partial | Layering and runtime ownership documented in `docs/architecture.md`. Lightweight enforcement exists via review and test discipline; automated import-lint remains a follow-up. |
| ADR set created for major Step 1 decisions | met | `docs/adr/README.md` and ADR-0001 through ADR-0004 created. |
| Architecture/index docs updated to match implementation | met | `docs/architecture.md` and `docs/index.md` updated with V1 Step 1 runtime policy and links to V1/ADR artifacts. |
| Regression and full test suites pass | met | Targeted: `uv run pytest tests/test_app.py tests/test_db.py tests/services/test_worker.py -q`; full suite: `uv run pytest -q`. |
| Step 1 results artifact published | met | This document (`docs/ver1/ver1-step1-results.md`) created and updated with summary, evidence, risks, and checklist. |
Step 1 is complete and ready to hand off to Ver1 Step 2.