Honcho issues CREATE EXTENSION IF NOT EXISTS vector before migrations
and again at server startup, both using the DB_CONNECTION_URI role. On
deployments where that role deliberately cannot create extensions
(managed Postgres, Kubernetes operators, NixOS), both statements fail
with a privilege error — IF NOT EXISTS does not save you, because
Postgres checks the privilege before checking for the extension.
Document preinstalling pgvector as a privileged role as the supported
path, and add a troubleshooting entry keyed to the exact error string.
Note that docker compose is unaffected, since the bundled database
service creates the extension via an initdb script.
Refs #614
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
66c80a5da6