Merge database changes into single patch file

db/patch-heartbeat-add-last-notified-time.sql

@@ -1,7 +0,0 @@
--- You should not modify if this have pushed to Github, unless it does serious wrong with the db.
-BEGIN TRANSACTION;
-
-ALTER TABLE heartbeat
-    ADD last_notified_time DATETIME default null;
-
-COMMIT;

db/patch-monitor-add-resend-interval.sql

@@ -4,4 +4,7 @@ BEGIN TRANSACTION;
 ALTER TABLE monitor
     ADD resend_interval INTEGER default 0 not null;
 
+ALTER TABLE heartbeat
+    ADD last_notified_time DATETIME default null;
+
 COMMIT;