datetime

gistfile1.txt

import datetime

#IN THE MODEL
class Transaction(ndb.Model):
  address = ndb.StringProperty(required=True)
  ndb.FloatProperty(required=True)
  timestamp = ndb.DateTimeProperty(required=True)

#USAGE IN A HANDLER
  t = Transaction(address=a.address, tAmt=a.balance, timestamp=datetime.datetime.now()) 
  t.put()
  

#QUERYING AND DETERMINING 
  ttime = t.timestamp
  expiry = datetime.timedelta(minutes=60) + ttime
  if curr >= expiry:
    t.key.delete()