Create unique constraint on app_usage_consumers

Author: joyvuu-dave

db/migrations/20250527000000_add_unique_constraint_to_usage_consumers.rb

@@ -0,0 +1,13 @@
+Sequel.migration do
+  change do
+    alter_table :app_usage_consumers do
+      add_index :consumer_guid, unique: true, name: :app_usage_consumers_consumer_guid_unique
+      add_index :last_processed_guid, name: :app_usage_consumers_last_processed_guid_index
+    end
+
+    alter_table :service_usage_consumers do
+      add_index :consumer_guid, unique: true, name: :service_usage_consumers_consumer_guid_unique
+      add_index :last_processed_guid, name: :service_usage_consumers_last_processed_guid_index
+    end
+  end
+end