feat(logs): Rename datetime -> timestamp

app.py

@@ -27,7 +27,7 @@ def new_card(pull: int, saved: int) -> Dict[str, Union[Details, str]]:
     card_logs.append({
         "pull": pull,
         "saved": saved,
-        "datetime": strftime('%Y-%m-%dT%H:%M:%SZ', gmtime())
+        "timestamp": strftime('%Y-%m-%dT%H:%M:%SZ', gmtime())
     })
 
     details: Details = rand_details()