In almost 30 years of working with computerized collection records (in PastPerfect and a variety of other databases) I’ve always found it convenient to lump historical artifacts, archival materials, fine arts, archaeological materials and even natural science specimens into a single searchable file, table or module (e.g. the PastPerfect “objects” module). It greatly facilitates across-the-board queries in most instances. Most catalog entries, in most museum collections, really don’t require the availability of highly specialized data fields beyond those needed for more generic objects. If you work in an institution where you, or somebody, actually has the information or expertise required to fill in dozens or scores of discipline-specific data fields then your situation may be different.