fix archiver selecting oldest timestamp in database, fix systemd

iarchiver/database.py

@@ -76,7 +76,7 @@ class EmailDatabase:
 
     def have_we_done_a_full_sync_at_all(self):
         cursor = self.conn.cursor()
-        cursor.execute("SELECT * FROM syncs ORDER BY timestamp LIMIT 1")
+        cursor.execute("SELECT * FROM syncs ORDER BY timestamp DESC LIMIT 1")
         row = cursor.fetchone()
         cursor.close()
         if row is not None:

systemd/imaparchiver.service

@@ -8,7 +8,7 @@ User=emailsync
 Group=emailsync
 ExecStart=/srv/email/imap-archiver/venv/bin/python3 /srv/email/imap-archiver/run.py --config /srv/email/imap-archiver/config.yml
 SyslogIdentifier=imap-archiver
-Restart=always
+Restart=on-failure
 WatchdogSec=600
 
 [Install]