single hit per search uuid

core/src/main/groovy/com/muwire/core/content/Matcher.groovy

@@ -4,6 +4,7 @@ import com.muwire.core.search.QueryEvent
 
 abstract class Matcher {
     final List<Match> matches = Collections.synchronizedList(new ArrayList<>())
+    final Set<UUID> uuids = new HashSet<>()
     
     protected abstract boolean match(List<String> searchTerms);
     
@@ -11,7 +12,7 @@ abstract class Matcher {
     
     public void process(QueryEvent qe) {
         def terms = qe.searchEvent.searchTerms
-        if (match(terms)) {
+        if (match(terms) && uuids.add(qe.searchEvent.uuid)) {
             long now = System.currentTimeMillis()
             matches << new Match(persona : qe.originator, keywords : terms, timestamp : now)
         }