Drive-by: Depot provides a CountRecord.

src/main/java/com/threerings/user/depot/DepotUserRepository.java

@@ -19,6 +19,7 @@ import com.google.common.collect.Lists;
 import com.google.common.collect.Sets;
 import com.google.inject.Inject;
 import com.google.inject.Singleton;
+import com.samskivert.depot.CountRecord;
 import com.samskivert.depot.DepotRepository;
 import com.samskivert.depot.DuplicateKeyException;
 import com.samskivert.depot.Funcs;
@@ -82,14 +83,6 @@ public class DepotUserRepository extends DepotRepository
         DEADBEAT;
     }
 
-    @Computed @Entity
-    public static class CountRecord extends PersistentRecord
-    {
-        /** The computed count. */
-        @Computed(fieldDefinition="count(*)")
-        public int count;
-    }
-
     @Inject public DepotUserRepository (PersistenceContext ctx)
     {
         super(ctx);