Add Grafana integration for CareLink data - #38
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- Introduced a new command-line argument `--replica-database` to specify a read-only DuckDB replica for Grafana. - Implemented the `publish_replica` method in `CareLinkStorage` to atomically publish data to the specified replica database. - Updated the `start_webserver` function to handle the new argument and call the publish method after saving data. - Modified the systemd service file to include the new `--replica-database` argument for the CareLink proxy service.
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Add Grafana integration for CareLink data
Grafana can visualize the historical CareLink data retained in DuckDB, but it must not query the proxy's actively-written database file. DuckDB is file-based and the proxy is its writer, so the integration publishes a separate read-only replica for Grafana instead.
The replica keeps a stable DuckDB catalog and atomically replaces its Parquet-backed data. This lets Grafana's long-lived datasource connection see new data safely without opening or locking the proxy's primary database.
Changes
--replica-databaseto publish a Grafana-readable DuckDB replica.Dashboard
This is a live dashboard of my own CGM readings.