Maintainers for postgresql-client are Debian PostgreSQL Maintainers <team+postgresql@tracker.debian.org>.
You may want to refer to the following packages that are part of the same source: postgresql, postgresql-all, postgresql-client-common, postgresql-common, postgresql-contrib, postgresql-doc, postgresql-server-dev-all.
You might like to refer to the postgresql-client package page, to the Package Tracking System, or to the source package src:postgresql-common's bug page.
If you find a bug not listed here, please report it.