try to fix "Illegal attempt to associate a ManagedEntity with two open persistence contexts"

commafeed-server/src/main/java/com/commafeed/backend/dao/GenericDAO.java

@@ -43,6 +43,14 @@ public abstract class GenericDAO<T extends AbstractModel> {
 		models.forEach(this::saveOrUpdate);
 	}
 
+	public void persist(T model) {
+		entityManager.persist(model);
+	}
+
+	public T merge(T model) {
+		return entityManager.merge(model);
+	}
+
 	public T findById(Long id) {
 		return entityManager.find(entityClass, id);
 	}

commafeed-server/src/main/java/com/commafeed/backend/feed/FeedRefreshUpdater.java

@@ -157,7 +157,7 @@ public class FeedRefreshUpdater {
 			feedUpdated.mark();
 		}
 
-		unitOfWork.run(() -> feedService.save(feed));
+		unitOfWork.run(() -> feedService.update(feed));
 
 		notifyOverWebsocket(unreadCountBySubscription);
 

commafeed-server/src/main/java/com/commafeed/backend/service/FeedService.java

@@ -47,18 +47,18 @@ public class FeedService {
 			feed.setNormalizedUrl(normalizedUrl);
 			feed.setNormalizedUrlHash(normalizedUrlHash);
 			feed.setDisabledUntil(Models.MINIMUM_INSTANT);
-			feedDAO.saveOrUpdate(feed);
+			feedDAO.persist(feed);
 		}
 		return feed;
 	}
 
-	public void save(Feed feed) {
+	public void update(Feed feed) {
 		String normalized = FeedUtils.normalizeURL(feed.getUrl());
 		feed.setNormalizedUrl(normalized);
 		feed.setNormalizedUrlHash(Digests.sha1Hex(normalized));
 		feed.setLastUpdated(Instant.now());
 		feed.setEtagHeader(FeedUtils.truncate(feed.getEtagHeader(), 255));
-		feedDAO.saveOrUpdate(feed);
+		feedDAO.merge(feed);
 	}
 
 	public Favicon fetchFavicon(Feed feed) {