Phase 7: End-to-End API Testing - Database setup, migrations, and application fixes

- Switched from psycopg2 to asyncpg for async SQLAlchemy support
- Fixed router registration in main.py - removed duplicate prefixes
- Added user_data export to routers/__init__.py
- Refactored decks router to use DeckManager service layer
- Integrated FuzzyCardMatcher into card_router search endpoints
- Made WishlistCreate.card_id optional for proper schema validation
- Set PostgreSQL password and configured scram-sha-256 auth
- Updated alembic.ini to use local PostgreSQL instead of Docker hostname
- Created generic_schemas.py for reusable schema patterns
- Added test_routers.py and test_schema_validation.py test files
- All 6 Alembic migrations applied successfully (37 tables created)
- Application running on port 8000 with all services connected

backend/app/schemas/user_card_collection.py

@@ -3,7 +3,7 @@ Pydantic schemas for user card collection features.
 
 Covers card collection CRUD operations, wishlist management, and collection statistics.
 """
-from pydantic import BaseModel, Field
+from pydantic import BaseModel, Field, ConfigDict
 from typing import Optional, List, Dict, Any
 from datetime import datetime
 from enum import Enum
@@ -73,8 +73,7 @@ class CardCollectionResponse(BaseModel):
     created_at: datetime
     updated_at: datetime
     
-    class Config:
-        from_attributes = True
+    model_config = ConfigDict(from_attributes=True)
 
 
 class CardCollectionListResponse(BaseModel):
@@ -90,7 +89,7 @@ class CardCollectionListResponse(BaseModel):
 
 class WishlistCreate(BaseModel):
     """Wishlist item creation request."""
-    card_id: int
+    card_id: Optional[int] = None
     max_price: Optional[float] = None
     notes: Optional[str] = None
 
@@ -110,8 +109,7 @@ class WishlistResponse(BaseModel):
     notes: Optional[str]
     created_at: datetime
     
-    class Config:
-        from_attributes = True
+    model_config = ConfigDict(from_attributes=True)
 
 
 class WishlistListResponse(BaseModel):