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harlequin-questdb

A Harlequin adapter for QuestDB, connecting via QuestDB's PostgreSQL wire protocol.

The package name is harlequin-questdb. The source repository is rhuygen/harlequin-questdb.

Installation

uv tool install harlequin --with harlequin-questdb

Or with pip:

pip install harlequin-questdb

Upgrading

To upgrade Harlequin, the adapter, or both, run:

uv tool upgrade harlequin --with harlequin-questdb

This upgrades harlequin to the latest compatible version and refreshes harlequin-questdb at the same time. Run the same command regardless of which package was bumped. This release requires Harlequin 2.5 or newer.

Usage

Connect to a local QuestDB instance using the defaults (host localhost, port 8812, user admin, password quest):

harlequin -a questdb

An omitted password is quest. Pass --password when the server uses a different one.

harlequin -a questdb --host myserver --port 8812 --username myuser --password mypassword

A libpq connection string supplies host, user, and password on its own. Defaults for those fields are not applied on top of the string:

harlequin -a questdb "host=myserver port=8812 user=myuser password=mypassword dbname=qdb"

The constructor also accepts user as an alias of username. The CLI flag remains --username (-u).

Connection options

Option Short Default Description
--host -h localhost QuestDB host name or IP address
--port -p 8812 PostgreSQL wire protocol port
--username -u admin QuestDB username
--password quest QuestDB password. Omitted values use quest.
--dbname -d qdb Libpq database field. QuestDB ignores logical database names.
--connect-timeout Seconds before connect fails
--sslmode disable PGWire SSL mode when no connection string is given

docker-compose.yml publishes QuestDB 8.2.2 on 127.0.0.1:8812 for local development. If localhost resolves to an IPv6 address that the bind does not cover, pass --host 127.0.0.1.

Catalog

The sidebar is a database → schema → relation → column tree. A table partitioned by day is labeled t·DAY. A designated timestamp column is labeled with a star, for example ts★.

Details, time-series examples, and limits are in docs/USER_GUIDE.md and docs/KNOWN_LIMITATIONS.md.

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