delete entries with no feeds

src/main/java/com/commafeed/backend/DatabaseCleaner.java

@@ -40,6 +40,19 @@ public class DatabaseCleaner {
 		log.info("cleanup done: {} feeds without subscriptions deleted", total);
 		return total;
 	}
+	
+	public long cleanEntriesWithoutFeeds() {
+
+		long total = 0;
+		int deleted = -1;
+		do {
+			deleted = feedEntryDAO.deleteWithoutFeeds(100);
+			total += deleted;
+			log.info("removed {} entries without feeds", total);
+		} while (deleted != 0);
+		log.info("cleanup done: {} entries without feeds deleted", total);
+		return total;
+	}
 
 	public long cleanEntriesOlderThan(long value, TimeUnit unit) {
 		Calendar cal = Calendar.getInstance();

src/main/java/com/commafeed/backend/dao/FeedEntryDAO.java

@@ -7,6 +7,7 @@ import javax.ejb.Stateless;
 import javax.inject.Inject;
 import javax.persistence.TypedQuery;
 import javax.persistence.criteria.CriteriaQuery;
+import javax.persistence.criteria.JoinType;
 import javax.persistence.criteria.Root;
 import javax.persistence.criteria.SetJoin;
 
@@ -88,4 +89,20 @@ public class FeedEntryDAO extends GenericDAO<FeedEntry> {
 		delete(list);
 		return deleted;
 	}
+
+	public int deleteWithoutFeeds(int max) {
+		CriteriaQuery<FeedEntry> query = builder.createQuery(getType());
+		Root<FeedEntry> root = query.from(getType());
+
+		SetJoin<FeedEntry, Feed> join = root.join(FeedEntry_.feeds,
+				JoinType.LEFT);
+		query.where(builder.isNull(join.get(Feed_.id)));
+		TypedQuery<FeedEntry> q = em.createQuery(query);
+		q.setMaxResults(max);
+
+		List<FeedEntry> list = q.getResultList();
+		int deleted = list.size();
+		delete(list);
+		return deleted;
+	}
 }

src/main/java/com/commafeed/frontend/rest/resources/AdminREST.java

@@ -249,6 +249,8 @@ public class AdminREST extends AbstractResourceREST {
 		Map<String, Long> map = Maps.newHashMap();
 		map.put("feeds_without_subscriptions",
 				cleaner.cleanFeedsWithoutSubscriptions());
+		map.put("entries_without_feeds",
+				cleaner.cleanEntriesWithoutFeeds());
 		return Response.ok(map).build();
 	}