A SignalK server plugin that tracks recurring boat maintenance — oil changes, winch service, watermaker filters, and anything else that comes due by engine hours, by calendar time, or both.

• Tasks with two interval dimensions — runtime hours (read live from a SignalK path such as propulsion.port.runTime) and/or calendar time (days/weeks/months/years). Add a one-time calendar due date for a one-off job, or leave every interval blank to keep a plain informational record.
• Status tracking — each task is overdue, due soon, ok, or info; the task list sorts most-urgent first. Any task can override the plugin-wide "due soon" lead windows with its own runtime-hours and calendar-days thresholds.
• Maintenance log — per-task history plus a master log across all tasks, with markdown notes and who logged the work. Export the log as CSV, Markdown, or JSON.
• Inventory integration — link the parts a task consumes to your signalk-stowage-mgmt inventory, see live stock badges next to each task, and auto-decrement stock when a task is completed. Fully opt-in (see below).
• SignalK notifications and paths — overdue/due-soon status is published to notifications.maintenance.{slug} with a configurable alarm state per task status, and each task can also publish to maintenance.{slug}.data and maintenance.{slug}.status, so it shows up in any SignalK notification consumer or dashboard.
• Modern webapp — buildless Preact SPA served from the SignalK webapps menu: searchable/filterable task table, tag chips, progress bars, light/dark theme, live polling. Runs on browsers as old as Chromium 69 (Navico/B&G MFDs) — no bundler, no transpile step; the files in public/ are exactly what the browser executes.
• SignalK-native auth — the webapp logs in against the server's own /signalk/v1/auth/* endpoints; the server enforces access to the API. The plugin adds no auth of its own.
• Zero native dependencies — SQLite via Node's built-in node:sqlite, ideal on a Raspberry Pi. Requires Node ≥ 22.5 (SignalK on Node 24 recommended).

From the SignalK Appstore (once published), or manually:

cd ~/.signalk
npm install signalk-maintenance-tracker

Enable the plugin in the SignalK admin UI (Server → Plugin Config → Maintenance Tracker). The webapp appears under Webapps as Maintenance Tracker; data is stored in the plugin's data directory as maintenance.db.

Maintenance tasks can now link directly to your signalk-stowage-mgmt inventory. Set the signalk-stowage-mgmt API URL option (e.g. http://localhost:3000/plugins/signalk-stowage-mgmt) to turn it on:

• Link parts to tasks — "Oil change" needs a filter and 5 L of oil? Tag them right in the task editor, autocompleted straight from your stowage-mgmt items.
• See stock at a glance — tasks show In stock / Low stock / Out of stock right next to the due-date badge. No more "task's due but I'm out of filters" surprises.
• Auto-decrement on completion — mark a task done and it knocks the used quantity off your inventory automatically (opt-in checkbox, on by default).
• Split across locations? You pick. If a part lives in more than one spot on the boat, you choose which location(s) it came from right in the completion dialog — no guessing on the software's part.

Fully optional — leave the API URL blank (the default) and none of this does anything.

Mounted at /plugins/signalk-maintenance-tracker/api (access controlled by the SignalK server — currently admin):

• GET/POST /tasks, GET/PUT/DELETE /tasks/:slug
• GET/POST /tasks/:slug/logs (POST = mark complete)
• GET /logs, PUT/DELETE /logs/:id
• GET /tags
• GET /health

See docs/specification.md for the full spec.

Setup, the buildless webapp workflow, CI, and the release process are documented in DEVELOPMENT.md.

MIT