Document weight

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+I track some health metrics on self-hosted infrastructure.
+
+[schema.sql](schema.sql) is a PostgreSQL database schema with the health metrics tables.
+The `zqxjk` schema uses [zqxjkcrud](https://github.com/alexpdp7/zqxjkcrud/) to generate a frontend where I can input metrics.
+Dashboards in Grafana display the metrics.