Fix: error 500 on get_credit_balances_handler (#972)

This pull request makes a small change to how credit balances are formatted in the `get_credit_balances_handler` function. Instead of using the `model_validate` method, it now explicitly creates `AddressCreditBalanceResponse` objects using the address and credits values from each balance.

Author: 1yam

src/aleph/db/accessors/balances.py

@@ -367,8 +367,7 @@ def get_credit_balances(
     page: int = 1,
     pagination: int = 100,
     min_balance: int = 0,
-    **kwargs,
-):
+) -> list[tuple[str, int]]:
     """
     Get paginated credit balances for all addresses.
     Uses the cached balances from the credit_balances table.
@@ -388,7 +387,7 @@ def get_credit_balances(
     return [(row.address, row.balance) for row in results]
 
 
-def count_credit_balances(session: DbSession, min_balance: int = 0, **kwargs):
+def count_credit_balances(session: DbSession, min_balance: int = 0) -> int:
     """
     Count addresses with credit balances.
     Uses the cached balances from the credit_balances table.

src/aleph/web/controllers/accounts.py

@@ -221,10 +221,13 @@ async def get_credit_balances_handler(request: web.Request) -> web.Response:
         credit_balances = get_credit_balances(session, **find_filters)
 
         formatted_credit_balances = [
-            AddressCreditBalanceResponse.model_validate(b) for b in credit_balances
+            AddressCreditBalanceResponse(address=address, credits=credits)
+            for address, credits in credit_balances
         ]
 
-        total_credit_balances = count_credit_balances(session, **find_filters)
+        total_credit_balances = count_credit_balances(
+            session, find_filters.get("min_balance", 0)
+        )
 
         pagination_page = query_params.page
         pagination_per_page = query_params.pagination