fix(users): update referral code handling to ensure uniqueness and proper formatting

Implement logic to clean and standardize referral codes in the users table. This includes setting referral codes to NULL if they are empty or consist only of whitespace, and generating unique referral codes for users with duplicates. The changes enhance data integrity and ensure consistent formatting of referral codes across the database.

db/dal/payment_dal.py

@@ -225,7 +225,14 @@ async def mark_provider_payment_processing_once(
         Payment.status != "processing",
     ]
     if expected_status_prefix:
-        conditions.append(Payment.status.like(f"{expected_status_prefix}%"))
+        if expected_status_prefix == "pending":
+            # YooKassa may keep authorized payments in waiting_for_capture
+            # before reporting a final successful capture webhook.
+            conditions.append(
+                Payment.status.in_(("waiting_for_capture", "pending", "pending_yookassa"))
+            )
+        else:
+            conditions.append(Payment.status.like(f"{expected_status_prefix}%"))
 
     stmt = (
         update(Payment)