Index: trunk/ippTools/src/difftool.c
===================================================================
--- trunk/ippTools/src/difftool.c	(revision 23740)
+++ trunk/ippTools/src/difftool.c	(revision 23873)
@@ -1748,4 +1748,5 @@
   PXOPT_LOOKUP_STR(outfile, config->args, "-outfile", true,  false);
   PXOPT_LOOKUP_U64(limit,   config->args, "-limit",   false, false);
+  PXOPT_LOOKUP_BOOL(clean, config->args, "-clean", false);
 
   FILE *f = fopen (outfile, "w");
@@ -1793,11 +1794,27 @@
     psArray *output = p_psDBFetchResult(config->dbh);
     if (!output) {
-      psError(PS_ERR_UNKNOWN, false, "database error");
       return false;
     }
     if (!psArrayLength(output)) {
-      psTrace("regtool", PS_LOG_INFO, "no rows found");
+      psError(PS_ERR_UNKNOWN, true, "no rows found");
       psFree(output);
-      return true;
+      return false;
+    }
+
+    if (clean) {
+        bool success = true; 
+        if (!strcmp(tables[i].tableName, "diffRun")) {
+            success = pxSetStateCleaned("diffRun", "state", output);
+#ifdef notyet
+        // diffSkyfile doesn't have dataState yet
+        } else if (!strcmp(tables[i].tableName, "diffSkyfile")) {
+            success = pxSetStateCleaned("diffSkyfile", "data_state", output);
+#endif
+        }
+        if (!success) {
+            psFree(output);
+            psError(PS_ERR_UNKNOWN, false, "pxSetStateClean failed for table %s",  tables[i].tableName);
+            return false;
+        }
     }