MeterVault

A self-hosted, local-first energy & utility metering platform. MeterVault pulls meter data from Home Assistant, Tasmota and raw MQTT on a schedule, stores every reading timestamped and immutable, normalizes it into consumption, and turns it into cost dashboards. Energy types (electricity, water, heating oil, gas, district heat, …) and meters are user-defined — nothing is hardcoded.

Successor to a hand-maintained Energiebilanz spreadsheet. See docs/SDD.md for the full design.

Features

• Automatic ingestion from MQTT/Tasmota (persistent subscriptions) and Home Assistant (REST poll or push), plus manual entry, a REST push API, and CSV import.
• Immutable raw readings on a TimescaleDB hypertable; a normalized, append-only consumption layer on top — reproducible, auditable.
• Seven measurement modes (cumulative/generation registers, burner runtime, tank/consumable, direct delta, instant rate, virtual). Handles meter swaps, counter resets, tank dip-sticks with calibration, and virtual meters defined by an expression (PV self-consumption, savings, net).
• Tariff engine with time-ranged price history (unit/base/feed-in), scoped global / per type / per meter; cost categories decoupled from energy types; meterless manual costs.
• Continuous aggregates (daily/monthly/yearly, local timezone) so dashboards never scan raw.
• Dashboard: cost KPIs with period-over-period deltas, "what costs most", a "what cost more/ less" difference view, trends, meter list, one-click reference-data load, CSV dry-run.
• REST API + OpenAPI/Swagger, API-key auth, reverse-proxy trust (Authelia/Traefik).
• JSON config export/import for portability; Docker Compose + multi-arch image.

Quick start (Docker)

docker compose -f deploy/docker-compose.yml up -d
# open http://localhost:8080  → Import → "Load reference data" for a populated demo
# API docs at http://localhost:8080/swagger

Configuration is via environment variables (Section__Key double-underscore mapping), e.g.:

Variable	Purpose
ConnectionStrings__Default	PostgreSQL/Timescale connection string
MeterVault__TimeZone	Local timezone for buckets/display (default Europe/Berlin)
MeterVault__ApiKeys__0	An API key accepted on the X-Api-Key header
MeterVault__ReverseProxyTrust	true to honour X-Forwarded-User behind an auth proxy
MeterVault__EnableLiveIngestion	false to disable the MQTT/HA workers

Secrets (broker/HA tokens) are never stored in the database — endpoint configs hold the name of an environment variable, resolved at runtime.

Pushing readings (Home Assistant)

curl -X POST http://localhost:8080/api/v1/readings \
  -H "X-Api-Key: $METERVAULT_API_KEY" -H "Content-Type: application/json" \
  -d '[{"meterId": 1, "time": "2026-01-01T12:00:00Z", "value": 47200}]'

See docs/wiring.md for wiring up Tasmota, MQTT and Home Assistant.

Development

dotnet build
dotnet test                       # integration tests spin a TimescaleDB via Testcontainers (needs Docker)
dotnet test tests/Core.Tests      # fast unit tests, no Docker
dotnet run --project src/App

Architecture, project layout and conventions live in CLAUDE.md.

Releasing

Edit the VERSION file on main; CI tags vX.Y.Z and builds/pushes a multi-arch image (.github/workflows/). Locally: pwsh deploy/build-and-push.ps1 -Push.

License

Not yet chosen (see SDD §14). Add a LICENSE before the first public tag.