PDBQ is a backend service that collects information about software packages into a database for querying. It's intended for tracking versions of packages in different distros, pockets, etc. and the various problems preventing a package from transitioning from one place to another. It intends to be not just a read-only collection of data but to also allow comments and notes to be associated with these transition issues, and to facilitate planning and coordination of package merging work.

Conceptually this descends from a similar tool made years ago, https://code.launchpad.net/package-status, but is rewritten with more modern web technologies (SQL Alchemy, Flask, and Python3), and is expanded to collect a larger variety of data.