old_contents: from datetime import datetime
  
  create_or_update_free_sms_fragment_limit_schema = {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "description": "POST annual billing schema",
      "type": "object",
      "title": "Create",
      "properties": {
          "free_sms_fragment_limit": {"type": "integer", "minimum": 1},
      },
      "required": ["free_sms_fragment_limit"]
  }
  
  
  def serialize_ft_billing_remove_emails(data):
      results = []
      billed_notifications = [x for x in data if x.notification_type != 'email']
      for notification in billed_notifications:
          json_result = {
              "month": (datetime.strftime(notification.month, "%B")),
              "notification_type": notification.notification_type,
              "billing_units": notification.billable_units,
              "rate": float(notification.rate),
              "postage": notification.postage,
          }
          results.append(json_result)
      return results
  
  
  def serialize_ft_billing_yearly_totals(data):
      yearly_totals = []
      for total in data:
          json_result = {
              "notification_type": total.notification_type,
              "billing_units": total.billable_units,
              "rate": float(total.rate),
              "letter_total": float(total.billable_units * total.rate) if total.notification_type == 'letter' else 0
          }
          yearly_totals.append(json_result)
  
      return yearly_totals
  
new_contents: from datetime import datetime
  
  create_or_update_free_sms_fragment_limit_schema = {
      "$schema": "http://json-schema.org/draft-04/schema#",
      "description": "POST annual billing schema",
      "type": "object",
      "title": "Create",
      "properties": {
          "free_sms_fragment_limit": {"type": "integer", "minimum": 0},
      },
      "required": ["free_sms_fragment_limit"]
  }
  
  
  def serialize_ft_billing_remove_emails(data):
      results = []
      billed_notifications = [x for x in data if x.notification_type != 'email']
      for notification in billed_notifications:
          json_result = {
              "month": (datetime.strftime(notification.month, "%B")),
              "notification_type": notification.notification_type,
              "billing_units": notification.billable_units,
              "rate": float(notification.rate),
              "postage": notification.postage,
          }
          results.append(json_result)
      return results
  
  
  def serialize_ft_billing_yearly_totals(data):
      yearly_totals = []
      for total in data:
          json_result = {
              "notification_type": total.notification_type,
              "billing_units": total.billable_units,
              "rate": float(total.rate),
              "letter_total": float(total.billable_units * total.rate) if total.notification_type == 'letter' else 0
          }
          yearly_totals.append(json_result)
  
      return yearly_totals
  
subject: Allow the free SMS fragment limit to be 0