bvandeusenandClaude Opus 5 1fcfd47ab6
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fix(startup): a slow database costs seconds, not the instance (#4181)
On 2026-09-19 a host storage stall made one Postgres checkpoint of 14
buffers take 281 seconds against a 1.3-second baseline. The app restarted
into the tail of it, `get_maintenance_hour()` — the first DB read in
`before_serving` — hung with no deadline, Hypercorn killed the worker at
its 60-second lifespan timeout, and nothing retries a failed lifespan. A
five-minute disk hiccup became a three-hour outage that only a human
restart could clear. Every MCP call returned 405, which reads like a
routing fault and was nothing of the kind: nothing was serving.

Three changes, none of which prevent a stall — they stop a transient one
becoming a permanent one.

1. THE STARTUP READ IS BOUNDED (rule 156). `get_maintenance_hour` already
   answered `_DEFAULT_HOUR` for a value it could not parse; a database
   that will not answer in three seconds is the same class of "no usable
   value here". The failure is now a WARNING naming the symptom — the
   breadcrumb whose absence meant this was only diagnosable from
   Postgres's own log — and a default run-hour, instead of the app.

2. THE BACKFILL NO LONGER RACES STARTUP. Its comment said it "never
   blocks the server from accepting requests": true of requests, false of
   startup, because the task began while `before_serving` was still
   running and competed for the same pool. Both of the incident's
   cancelled statements were in flight together. It now waits on a flag
   released on the hook's way out — in a `finally`, never after the work
   (rule 157), because an undeadlined wait is only safe when the wake-up
   cannot be missed.

3. THE ENGINE CANNOT WAIT FOREVER TO CONNECT. asyncpg's default is 60s,
   the whole lifespan budget spent before a query is sent. `command_timeout`
   is deliberately NOT set alongside it and the comment says why: it would
   apply to every statement, and this app runs long ones on purpose.

tests/test_startup_survives_a_slow_database.py asserts the shape rather
than the stall: a read that never returns still yields an hour, the
warning names the symptom, a healthy read is unaffected, the backfill
does no work before release, the flag is released even when startup
raises, and the engine's connect args carry a deadline but no blanket
statement timeout.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01821k5B3Ysecp9fNYs92Kuy
2026-09-19 10:50:57 -04:00

Fabled Scribe

A self-hosted work system-of-record for software projects, built to be driven by Claude Code. Notes, tasks, issues, projects, milestones, rules, and stored processes — reachable from Claude via a built-in MCP endpoint and a bundled Claude Code plugin, with a clean web UI for humans. No in-app LLM; Claude is the sole assistant.

Features

Notes and tasks with a Markdown editor, sub-tasks, milestones, issues, and kanban project workspaces. Stored processes, an engineering rulebook system (with an inception step that decides what each project inherits), and semantic search with proactive knowledge-injection into Claude's context. A knowledge graph, per-user/group sharing, and a built-in MCP server (/mcp) plus a bundled Claude Code plugin so Claude can record and recall your work directly.

Quick Start

Prerequisites: Docker and Docker Compose. No GPU or local model needed — Claude is the sole assistant, reached over MCP.

Download docker-compose.quickstart.yml from this repo, then:

# Optional but recommended — set a secret key
export SECRET_KEY=your-random-secret-here

docker compose -f docker-compose.quickstart.yml up -d

Open http://localhost:5000. The first user to register becomes admin. To connect Claude, create an API key under Settings → API Keys and install the Claude Code plugin — see API Keys & MCP.

Development: To build from source, see Development.

Documentation

Doc Contents
Architecture Stack, design decisions, data models, key services
Configuration Environment variables, Docker Compose, production setup, security
Features Detailed feature breakdown and keyboard shortcuts
Development Dev workflow, CI/CD, migrations, release process
API Keys & MCP API key management and Fable MCP install guide
SSO / OAuth OIDC setup for Authentik, Keycloak, and other providers
API Reference All REST API endpoints

License

This project is privately maintained.

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