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QuestDB

A time-series database that speaks the PostgreSQL wire protocol.

Read directly over pgwire. This is also how Plexus reads COSMOS, which stores its telemetry in QuestDB.

Run against QuestDB as shipped in COSMOS 7.3.0.

What Plexus reads
  • Any table you map, the same way as PostgreSQL
What it does not read
  • Writes. The connection is read-only
Connecting it
  1. 1Paste a connection string — Plexus does not attempt TLS on QuestDB unless you ask for it, because the open-source build has none on pgwire
Worth knowing
  • Timestamps are read as a number in the query rather than as a date, because a timestamp with no zone is otherwise parsed in the reader's local time and lands hours out.
Next

Connect it, and the dashboards build themselves from the first data that lands.

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