feat: Add unique constraint on sound hash and update related tests

tests/repositories/test_credit_transaction.py

@@ -2,6 +2,7 @@
 
 import json
 from collections.abc import AsyncGenerator
+from typing import Any
 
 import pytest
 import pytest_asyncio
@@ -19,7 +20,7 @@ class TestCreditTransactionRepository:
     async def credit_transaction_repository(
         self,
         test_session: AsyncSession,
-    ) -> AsyncGenerator[CreditTransactionRepository, None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[CreditTransactionRepository, None]:
         """Create a credit transaction repository instance."""
         yield CreditTransactionRepository(test_session)
 
@@ -29,6 +30,7 @@ class TestCreditTransactionRepository:
         test_user: User,
     ) -> int:
         """Get test user ID to avoid lazy loading issues."""
+        assert test_user.id is not None
         return test_user.id
 
     @pytest_asyncio.fixture
@@ -36,7 +38,7 @@ class TestCreditTransactionRepository:
         self,
         test_session: AsyncSession,
         test_user_id: int,
-    ) -> AsyncGenerator[list[CreditTransaction], None]:  # type: ignore[misc]
+    ) -> AsyncGenerator[list[CreditTransaction], None]:
         """Create test credit transactions."""
         transactions = []
         user_id = test_user_id
@@ -100,8 +102,8 @@ class TestCreditTransactionRepository:
     async def other_user_transaction(
         self,
         test_session: AsyncSession,
-        ensure_plans: tuple,  # noqa: ARG002
-    ) -> AsyncGenerator[CreditTransaction, None]:  # type: ignore[misc]
+        ensure_plans: tuple[Any, ...],  # noqa: ARG002
+    ) -> AsyncGenerator[CreditTransaction, None]:
         """Create a transaction for a different user."""
         from app.models.plan import Plan
         from app.repositories.user import UserRepository
@@ -142,7 +144,9 @@ class TestCreditTransactionRepository:
         test_transactions: list[CreditTransaction],
     ) -> None:
         """Test getting transaction by ID when it exists."""
-        transaction = await credit_transaction_repository.get_by_id(test_transactions[0].id)
+        transaction_id = test_transactions[0].id
+        assert transaction_id is not None
+        transaction = await credit_transaction_repository.get_by_id(transaction_id)
 
         assert transaction is not None
         assert transaction.id == test_transactions[0].id
@@ -342,6 +346,7 @@ class TestCreditTransactionRepository:
         assert transaction.balance_before == 100
         assert transaction.balance_after == 90
         assert transaction.success is True
+        assert transaction.metadata_json is not None
         assert json.loads(transaction.metadata_json) == {"test": "data"}
 
     @pytest.mark.asyncio
@@ -363,6 +368,7 @@ class TestCreditTransactionRepository:
 
         assert updated_transaction.id == transaction.id
         assert updated_transaction.description == "Updated description"
+        assert updated_transaction.metadata_json is not None
         assert json.loads(updated_transaction.metadata_json) == {"updated": True}
         # Other fields should remain unchanged
         assert updated_transaction.amount == transaction.amount
@@ -394,6 +400,7 @@ class TestCreditTransactionRepository:
         await credit_transaction_repository.delete(transaction)
 
         # Verify transaction is deleted
+        assert transaction_id is not None
         deleted_transaction = await credit_transaction_repository.get_by_id(transaction_id)
         assert deleted_transaction is None