payemnt billing and credits refactoring

backend/igny8_core/modules/billing/tasks.py

@@ -18,7 +18,7 @@ def replenish_monthly_credits():
     Runs on the first day of each month at midnight.
     
     For each active account with a plan:
-    - Adds plan.included_credits to account.credits
+    - Resets credits to plan.included_credits
     - Creates a CreditTransaction record
     - Logs the replenishment
     """
@@ -52,12 +52,11 @@ def replenish_monthly_credits():
                 skipped += 1
                 continue
             
-            # Add credits using CreditService
+            # Reset credits using CreditService
             with transaction.atomic():
-                new_balance = CreditService.add_credits(
+                new_balance = CreditService.reset_credits_for_renewal(
                     account=account,
-                    amount=monthly_credits,
-                    transaction_type='subscription',
+                    new_amount=monthly_credits,
                     description=f"Monthly credit replenishment - {plan.name} plan",
                     metadata={
                         'plan_id': plan.id,
@@ -69,7 +68,7 @@ def replenish_monthly_credits():
             
             logger.info(
                 f"Account {account.id} ({account.name}): "
-                f"Added {monthly_credits} credits (balance: {new_balance})"
+                f"Reset credits to {monthly_credits} (balance: {new_balance})"
             )
             replenished += 1