Only apply recent changes.

New users and password changes should be applied, but updaging
all users all the time would waste processing.

poll.py

@@ -1,4 +1,5 @@
 #! /bin/env python3
+from datetime import datetime, timezone, timedelta
 from requests import get, post, patch
 from os import getenv
 import logging
@@ -9,9 +10,15 @@ fingerpass = getenv('FINGER_PW')
 
 gitauth = (getenv('GIT_USER'), getenv('GIT_PW'))
 
-fingerurl = f'https://finger.stacken.kth.se/services/git/all'
 
-response = get(fingerurl, auth=('git', fingerpass))
+fingerurl = f'https://finger.stacken.kth.se/services/git/all'
+query = {}
+
+if True:
+     since = datetime.now(timezone.utc) - timedelta(minutes=30)
+     query['since'] = since.strftime("%Y-%m-%dT%T%Z")
+
+response = get(fingerurl, params=query, auth=('git', fingerpass))
 response.raise_for_status()
 
 for (user, passwd) in response.json().items():