Prevent thousands of SQL queries in Entity admin

arkindex/documents/admin.py

@@ -142,6 +142,7 @@ class EntityAdmin(admin.ModelAdmin):
     list_display = ('id', 'name', 'type')
     list_filter = [('type', EnumFieldListFilter), 'corpus']
     readonly_fields = ('id', )
+    raw_id_fields = ('worker_version', )
     search_fields = ('name', )
     inlines = (EntityLinkInLine, )
     form = EntityMetaForm