split orphan cleanup task in two

src/main/java/com/commafeed/backend/task/OrphanedContentsCleanupTask.java

@@ -0,0 +1,38 @@
+package com.commafeed.backend.task;
+
+import java.util.concurrent.TimeUnit;
+
+import javax.inject.Inject;
+import javax.inject.Singleton;
+
+import lombok.RequiredArgsConstructor;
+
+import com.commafeed.backend.service.DatabaseCleaningService;
+
+@RequiredArgsConstructor(onConstructor = @__({ @Inject }))
+@Singleton
+public class OrphanedContentsCleanupTask extends ScheduledTask {
+
+	private final DatabaseCleaningService cleaner;
+
+	@Override
+	public void run() {
+		cleaner.cleanContentsWithoutEntries();
+	}
+
+	@Override
+	public long getInitialDelay() {
+		return 20;
+	}
+
+	@Override
+	public long getPeriod() {
+		return 60;
+	}
+
+	@Override
+	public TimeUnit getTimeUnit() {
+		return TimeUnit.MINUTES;
+	}
+
+}