Update primary keys on customer data to UUIDs

- schema changes to primary and foreign keys
- fixture changes
- customer data models subclass AccountScopedRecord
- import script updated

app/models/webhook/delinquency_tracker.rb

@@ -1,4 +1,4 @@
-class Webhook::DelinquencyTracker < ApplicationRecord
+class Webhook::DelinquencyTracker < AccountScopedRecord
   DELINQUENCY_THRESHOLD = 10
   DELINQUENCY_DURATION = 1.hour
 

app/models/webhook/delivery.rb

@@ -1,4 +1,4 @@
-class Webhook::Delivery < ApplicationRecord
+class Webhook::Delivery < AccountScopedRecord
   STALE_TRESHOLD = 7.days
   USER_AGENT = "fizzy/1.0.0 Webhook"
   ENDPOINT_TIMEOUT = 7.seconds