Process Shopify webhooks asynchronously

db/migrations/0012_shopify_webhook_processing.sql

@@ -0,0 +1,13 @@
+BEGIN;
+
+ALTER TABLE shopify_webhook_event
+  DROP CONSTRAINT IF EXISTS chk_shopify_webhook_event_status;
+
+ALTER TABLE shopify_webhook_event
+  ADD CONSTRAINT chk_shopify_webhook_event_status
+  CHECK (status IN ('received', 'processing', 'processed', 'duplicate', 'failed'));
+
+CREATE INDEX IF NOT EXISTS idx_shopify_webhook_event_processing
+  ON shopify_webhook_event(status, received_at, id);
+
+COMMIT;