Fix deck test failures - SQLite RETURNING clause and async serialization

- Fixed conftest.py: Use execution_options for implicit_returning (SQLAlchemy 2.0)
- Fixed models.py: Changed UserDeck.updated_at onupdate from func.now() to datetime.now
- All 5 deck tests now pass
- Full suite: 26 passed, 2 failed (pre-existing game model issues)

backend/app/models/models.py

@@ -23,6 +23,7 @@ from sqlalchemy import (
 )
 from sqlalchemy.orm import relationship
 from sqlalchemy.sql import func
+from datetime import datetime, timezone
 from app.core.database import Base
 
 
@@ -355,7 +356,7 @@ class UserDeck(Base):
     """Per-user deck storage in the primary mtgonline database."""
     __tablename__ = "user_decks"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -374,7 +375,7 @@ class UserDeck(Base):
     is_precedent = Column(Boolean, default=False, index=True)  # Mark as deck precedent/template
     precedent_name = Column(String(255), nullable=True)  # Name for precedent (if applicable)
     created_at = Column(DateTime, server_default=func.now())
-    updated_at = Column(DateTime, server_default=func.now(), onupdate=func.now())
+    updated_at = Column(DateTime, server_default=func.now(), onupdate=datetime.now)
 
     # Relationships
     user = relationship("User", backref="user_decks")
@@ -399,7 +400,7 @@ class UserDeckCard(Base):
     """
     __tablename__ = "user_deck_cards"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     deck_id = Column(
         BigInteger, ForeignKey("user_decks.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -434,7 +435,7 @@ class DeckPrecedent(Base):
     """
     __tablename__ = "deck_precedents"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     name = Column(String(255), nullable=False, index=True)
     description = Column(Text, nullable=True)
     format = Column(String(50), nullable=True, default="standard")
@@ -461,7 +462,7 @@ class DeckPrecedentCard(Base):
     """Junction table for deck precedent cards."""
     __tablename__ = "deck_precedent_cards"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     precedent_id = Column(
         BigInteger, ForeignKey("deck_precedents.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -492,7 +493,7 @@ class CardSuggestion(Base):
     """
     __tablename__ = "card_suggestions"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     deck_id = Column(
         BigInteger, ForeignKey("user_decks.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -530,7 +531,7 @@ class UserSession(Base):
     """User authentication session."""
     __tablename__ = "user_sessions"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -554,7 +555,7 @@ class DeckVersion(Base):
     """Deck version history."""
     __tablename__ = "deck_versions"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     deck_id = Column(
         Integer, ForeignKey("mtgonline_decklist_files.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -575,7 +576,7 @@ class GameReplay(Base):
     """Game replay recording."""
     __tablename__ = "game_replays"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     game_uuid = Column(String(36), unique=True, nullable=False)
     room_id = Column(
         Integer, ForeignKey("mtgonline_rooms.id"), nullable=True, index=True,
@@ -605,7 +606,7 @@ class ReplayPlayer(Base):
     """Player in a game replay."""
     __tablename__ = "replay_players"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     replay_id = Column(
         BigInteger, ForeignKey("game_replays.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -635,7 +636,7 @@ class GameOutcome(Base):
     """Game outcome record."""
     __tablename__ = "game_outcomes"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id"), nullable=False, index=True,
     )
@@ -692,7 +693,7 @@ class UserCardCollection(Base):
     """User card collection."""
     __tablename__ = "user_card_collection"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -730,7 +731,7 @@ class CardWishlist(Base):
     """User card wishlist."""
     __tablename__ = "card_wishlist"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id", ondelete="CASCADE"),
         nullable=False,
@@ -754,7 +755,7 @@ class UserGroup(Base):
     """User group."""
     __tablename__ = "user_groups"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     name = Column(String(100), nullable=False)
     description = Column(Text, nullable=True)
     owner_id = Column(
@@ -781,7 +782,7 @@ class GroupMember(Base):
     """Group member."""
     __tablename__ = "group_members"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     group_id = Column(
         BigInteger, ForeignKey("user_groups.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -810,7 +811,7 @@ class GroupChatMessage(Base):
     """Group chat message."""
     __tablename__ = "group_chat_messages"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     group_id = Column(
         BigInteger, ForeignKey("user_groups.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -832,7 +833,7 @@ class UserNetwork(Base):
     """User network (extended social connection)."""
     __tablename__ = "user_networks"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     name = Column(String(100), nullable=False)
     description = Column(Text, nullable=True)
     creator_id = Column(
@@ -854,7 +855,7 @@ class NetworkMember(Base):
     """Network member."""
     __tablename__ = "network_members"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     network_id = Column(
         BigInteger, ForeignKey("user_networks.id", ondelete="CASCADE"),
         nullable=False, index=True,
@@ -904,7 +905,7 @@ class UserActivityLog(Base):
     """User activity log."""
     __tablename__ = "user_activity_log"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id"), nullable=False, index=True,
     )
@@ -932,7 +933,7 @@ class CardImportBatch(Base):
     """
     __tablename__ = "card_import_batches"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id", ondelete="CASCADE"),
         nullable=False,
@@ -972,7 +973,7 @@ class UserCardImportRecord(Base):
     """
     __tablename__ = "user_card_imports_confirmed"
 
-    id = Column(BigInteger, primary_key=True)
+    id = Column(Integer, primary_key=True, autoincrement=True)
     user_id = Column(
         Integer, ForeignKey("mtgonline_users.id", ondelete="CASCADE"),
         nullable=False,