fix part 3

backend/app/api/boards.py

@@ -8,7 +8,7 @@ from sqlalchemy.orm import Session
 
 from app.boards.repository import BoardRepository
 from app.boards.schemas import BoardCreate, BoardDetail, BoardSummary, BoardUpdate, ViewportStateUpdate
-from app.core.deps import get_current_user, get_db
+from app.core.deps import get_current_user, get_db_sync
 from app.database.models.user import User
 
 router = APIRouter(prefix="/boards", tags=["boards"])
@@ -18,7 +18,7 @@ router = APIRouter(prefix="/boards", tags=["boards"])
 def create_board(
     board_data: BoardCreate,
     current_user: Annotated[User, Depends(get_current_user)],
-    db: Annotated[Session, Depends(get_db)],
+    db: Annotated[Session, Depends(get_db_sync)],
 ):
     """
     Create a new board.
@@ -45,7 +45,7 @@ def create_board(
 @router.get("", response_model=dict)
 def list_boards(
     current_user: Annotated[User, Depends(get_current_user)],
-    db: Annotated[Session, Depends(get_db)],
+    db: Annotated[Session, Depends(get_db_sync)],
     limit: Annotated[int, Query(ge=1, le=100)] = 50,
     offset: Annotated[int, Query(ge=0)] = 0,
 ):
@@ -77,7 +77,7 @@ def list_boards(
 def get_board(
     board_id: UUID,
     current_user: Annotated[User, Depends(get_current_user)],
-    db: Annotated[Session, Depends(get_db)],
+    db: Annotated[Session, Depends(get_db_sync)],
 ):
     """
     Get board details by ID.
@@ -111,7 +111,7 @@ def update_board(
     board_id: UUID,
     board_data: BoardUpdate,
     current_user: Annotated[User, Depends(get_current_user)],
-    db: Annotated[Session, Depends(get_db)],
+    db: Annotated[Session, Depends(get_db_sync)],
 ):
     """
     Update board metadata.
@@ -157,7 +157,7 @@ def update_viewport(
     board_id: UUID,
     viewport_data: ViewportStateUpdate,
     current_user: Annotated[User, Depends(get_current_user)],
-    db: Annotated[Session, Depends(get_db)],
+    db: Annotated[Session, Depends(get_db_sync)],
 ):
     """
     Update board viewport state only (optimized for frequent updates).
@@ -198,7 +198,7 @@ def update_viewport(
 def delete_board(
     board_id: UUID,
     current_user: Annotated[User, Depends(get_current_user)],
-    db: Annotated[Session, Depends(get_db)],
+    db: Annotated[Session, Depends(get_db_sync)],
 ):
     """
     Delete a board (soft delete).

backend/app/api/sharing.py

@@ -1,6 +1,6 @@
 """Board sharing API endpoints."""
 
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 from uuid import UUID
 
 from fastapi import APIRouter, Depends, HTTPException, status
@@ -54,7 +54,7 @@ def validate_share_link(token: str, db: Session, required_permission: str = "vie
         )
 
     # Check expiration
-    if share_link.expires_at and share_link.expires_at < datetime.now(timezone.utc):
+    if share_link.expires_at and share_link.expires_at < datetime.now(UTC):
         raise HTTPException(
             status_code=status.HTTP_403_FORBIDDEN,
             detail="Share link has expired",
@@ -69,7 +69,7 @@ def validate_share_link(token: str, db: Session, required_permission: str = "vie
 
     # Update access tracking
     share_link.access_count += 1
-    share_link.last_accessed_at = datetime.now(timezone.utc)
+    share_link.last_accessed_at = datetime.now(UTC)
     db.commit()
 
     return share_link

backend/app/auth/jwt.py

@@ -1,6 +1,6 @@
 """JWT token generation and validation."""
 
-from datetime import datetime, timedelta, timezone
+from datetime import UTC, datetime, timedelta
 from uuid import UUID
 
 from jose import JWTError, jwt
@@ -21,11 +21,11 @@ def create_access_token(user_id: UUID, email: str, expires_delta: timedelta | No
         Encoded JWT token string
     """
     if expires_delta:
-        expire = datetime.now(timezone.utc) + expires_delta
+        expire = datetime.now(UTC) + expires_delta
     else:
-        expire = datetime.now(timezone.utc) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+        expire = datetime.now(UTC) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
 
-    to_encode = {"sub": str(user_id), "email": email, "exp": expire, "iat": datetime.now(timezone.utc), "type": "access"}
+    to_encode = {"sub": str(user_id), "email": email, "exp": expire, "iat": datetime.now(UTC), "type": "access"}
 
     encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
     return encoded_jwt

backend/app/boards/sharing.py

@@ -2,7 +2,7 @@
 
 import secrets
 import string
-from datetime import datetime, timezone
+from datetime import UTC, datetime
 
 from sqlalchemy.orm import Session
 
@@ -53,12 +53,12 @@ def validate_share_link_token(token: str, db: Session) -> ShareLink | None:
         return None
 
     # Check expiration
-    if share_link.expires_at and share_link.expires_at < datetime.now(timezone.utc):
+    if share_link.expires_at and share_link.expires_at < datetime.now(UTC):
         return None
 
     # Update access tracking
     share_link.access_count += 1
-    share_link.last_accessed_at = datetime.now(timezone.utc)
+    share_link.last_accessed_at = datetime.now(UTC)
     db.commit()
 
     return share_link

backend/app/core/deps.py

@@ -5,18 +5,16 @@ from uuid import UUID
 
 from fastapi import Depends, HTTPException, status
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
-from sqlalchemy import select
-from sqlalchemy.ext.asyncio import AsyncSession
-from sqlalchemy.orm import Session
-
-from app.auth.jwt import decode_access_token
-from app.database.models.user import User
-from app.database.session import get_db
 
 # For backwards compatibility with synchronous code
-from sqlalchemy import create_engine
-from sqlalchemy.orm import sessionmaker
+from sqlalchemy import create_engine, select
+from sqlalchemy.ext.asyncio import AsyncSession
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.auth.jwt import decode_access_token
 from app.core.config import settings
+from app.database.models.user import User
+from app.database.session import get_db
 
 # Sync engine for synchronous endpoints
 _sync_engine = create_engine(

backend/app/database/base.py

@@ -1,10 +1,9 @@
 """Base model for all database models."""
 
-from datetime import datetime, timezone
 from typing import Any
 from uuid import uuid4
 
-from sqlalchemy import Column, DateTime
+from sqlalchemy import Column, DateTime, func
 from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy.orm import DeclarativeBase, declared_attr
 
@@ -22,7 +21,7 @@ class Base(DeclarativeBase):
 
     # Common columns for all models
     id: Any = Column(UUID(as_uuid=True), primary_key=True, default=uuid4)
-    created_at: Any = Column(DateTime, default=lambda: datetime.now(timezone.utc), nullable=False)
+    created_at: Any = Column(DateTime, server_default=func.now(), nullable=False)
 
     def dict(self) -> dict[str, Any]:
         """Convert model to dictionary."""

backend/app/database/models/board.py

@@ -1,10 +1,10 @@
 """Board database model."""
 
-from datetime import datetime, timezone
+from datetime import datetime
 from typing import TYPE_CHECKING
 from uuid import UUID, uuid4
 
-from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text
+from sqlalchemy import Boolean, DateTime, ForeignKey, String, Text, func
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
@@ -42,9 +42,9 @@ class Board(Base):
         default=lambda: {"x": 0, "y": 0, "zoom": 1.0, "rotation": 0},
     )
 
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
+    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime, nullable=False, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc)
+        DateTime, nullable=False, server_default=func.now(), onupdate=func.now()
     )
     is_deleted: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
 

backend/app/database/models/board_image.py

@@ -1,10 +1,10 @@
 """BoardImage database model - junction table for boards and images."""
 
-from datetime import datetime, timezone
+from datetime import datetime
 from typing import TYPE_CHECKING
 from uuid import UUID, uuid4
 
-from sqlalchemy import DateTime, ForeignKey, Integer
+from sqlalchemy import DateTime, ForeignKey, Integer, func
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
@@ -52,9 +52,9 @@ class BoardImage(Base):
         PGUUID(as_uuid=True), ForeignKey("groups.id", ondelete="SET NULL"), nullable=True
     )
 
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
+    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime, nullable=False, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc)
+        DateTime, nullable=False, server_default=func.now(), onupdate=func.now()
     )
 
     # Relationships

backend/app/database/models/comment.py

@@ -1,9 +1,8 @@
 """Comment model for board annotations."""
 
 import uuid
-from datetime import datetime, timezone
 
-from sqlalchemy import Boolean, Column, DateTime, ForeignKey, String, Text
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, String, Text, func
 from sqlalchemy.dialects.postgresql import JSONB, UUID
 from sqlalchemy.orm import relationship
 
@@ -21,7 +20,7 @@ class Comment(Base):
     author_name = Column(String(100), nullable=False)
     content = Column(Text, nullable=False)
     position = Column(JSONB, nullable=True)  # Optional canvas position reference
-    created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
+    created_at = Column(DateTime, nullable=False, server_default=func.now())
     is_deleted = Column(Boolean, nullable=False, default=False)
 
     # Relationships

backend/app/database/models/group.py

@@ -1,10 +1,10 @@
 """Group database model."""
 
-from datetime import datetime, timezone
+from datetime import datetime
 from typing import TYPE_CHECKING
 from uuid import UUID, uuid4
 
-from sqlalchemy import DateTime, ForeignKey, String, Text
+from sqlalchemy import DateTime, ForeignKey, String, Text, func
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 
@@ -33,9 +33,9 @@ class Group(Base):
     color: Mapped[str] = mapped_column(String(7), nullable=False)  # Hex color #RRGGBB
     annotation: Mapped[str | None] = mapped_column(Text, nullable=True)
 
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
+    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.now())
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime, nullable=False, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc)
+        DateTime, nullable=False, server_default=func.now(), onupdate=func.now()
     )
 
     # Relationships

backend/app/database/models/image.py

@@ -1,10 +1,10 @@
 """Image database model."""
 
-from datetime import datetime, timezone
+from datetime import datetime
 from typing import TYPE_CHECKING
 from uuid import UUID, uuid4
 
-from sqlalchemy import BigInteger, DateTime, ForeignKey, Integer, String
+from sqlalchemy import BigInteger, DateTime, ForeignKey, Integer, String, func
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.dialects.postgresql import UUID as PGUUID
 from sqlalchemy.orm import Mapped, mapped_column, relationship
@@ -38,7 +38,7 @@ class Image(Base):
     height: Mapped[int] = mapped_column(Integer, nullable=False)
     image_metadata: Mapped[dict] = mapped_column(JSONB, nullable=False)
 
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
+    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.now())
     reference_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
 
     # Relationships

backend/app/database/models/share_link.py

@@ -1,9 +1,8 @@
 """ShareLink model for board sharing functionality."""
 
 import uuid
-from datetime import datetime, timezone
 
-from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String
+from sqlalchemy import Boolean, Column, DateTime, ForeignKey, Integer, String, func
 from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy.orm import relationship
 
@@ -19,7 +18,7 @@ class ShareLink(Base):
     board_id = Column(UUID(as_uuid=True), ForeignKey("boards.id", ondelete="CASCADE"), nullable=False)
     token = Column(String(64), unique=True, nullable=False, index=True)
     permission_level = Column(String(20), nullable=False)  # 'view-only' or 'view-comment'
-    created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
+    created_at = Column(DateTime, nullable=False, server_default=func.now())
     expires_at = Column(DateTime, nullable=True)
     last_accessed_at = Column(DateTime, nullable=True)
     access_count = Column(Integer, nullable=False, default=0)

backend/app/database/models/user.py

@@ -1,9 +1,8 @@
 """User model for authentication and ownership."""
 
 import uuid
-from datetime import datetime, timezone
 
-from sqlalchemy import Boolean, Column, DateTime, String
+from sqlalchemy import Boolean, Column, DateTime, String, func
 from sqlalchemy.dialects.postgresql import UUID
 from sqlalchemy.orm import relationship
 
@@ -18,8 +17,8 @@ class User(Base):
     id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
     email = Column(String(255), unique=True, nullable=False, index=True)
     password_hash = Column(String(255), nullable=False)
-    created_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc))
-    updated_at = Column(DateTime, nullable=False, default=lambda: datetime.now(timezone.utc), onupdate=lambda: datetime.now(timezone.utc))
+    created_at = Column(DateTime, nullable=False, server_default=func.now())
+    updated_at = Column(DateTime, nullable=False, server_default=func.now(), onupdate=func.now())
     is_active = Column(Boolean, nullable=False, default=True)
 
     # Relationships

backend/app/images/repository.py

@@ -49,25 +49,17 @@ class ImageRepository:
         result = await self.db.execute(select(Image).where(Image.id == image_id))
         return result.scalar_one_or_none()
 
-    async def get_user_images(
-        self, user_id: UUID, limit: int = 50, offset: int = 0
-    ) -> tuple[Sequence[Image], int]:
+    async def get_user_images(self, user_id: UUID, limit: int = 50, offset: int = 0) -> tuple[Sequence[Image], int]:
         """Get all images for a user with pagination."""
         from sqlalchemy import func
-        
+
         # Get total count efficiently
-        count_result = await self.db.execute(
-            select(func.count(Image.id)).where(Image.user_id == user_id)
-        )
+        count_result = await self.db.execute(select(func.count(Image.id)).where(Image.user_id == user_id))
         total = count_result.scalar_one()
-        
+
         # Get paginated images
         result = await self.db.execute(
-            select(Image)
-            .where(Image.user_id == user_id)
-            .order_by(Image.created_at.desc())
-            .limit(limit)
-            .offset(offset)
+            select(Image).where(Image.user_id == user_id).order_by(Image.created_at.desc()).limit(limit).offset(offset)
         )
         images = result.scalars().all()
         return images, total
@@ -126,17 +118,14 @@ class ImageRepository:
     async def get_board_images(self, board_id: UUID) -> Sequence[BoardImage]:
         """Get all images for a board, ordered by z-order."""
         result = await self.db.execute(
-            select(BoardImage)
-            .where(BoardImage.board_id == board_id)
-            .order_by(BoardImage.z_order.asc())
+            select(BoardImage).where(BoardImage.board_id == board_id).order_by(BoardImage.z_order.asc())
         )
         return result.scalars().all()
 
     async def get_board_image(self, board_id: UUID, image_id: UUID) -> BoardImage | None:
         """Get a specific board image."""
         result = await self.db.execute(
-            select(BoardImage)
-            .where(BoardImage.board_id == board_id, BoardImage.image_id == image_id)
+            select(BoardImage).where(BoardImage.board_id == board_id, BoardImage.image_id == image_id)
         )
         return result.scalar_one_or_none()
 
@@ -151,7 +140,7 @@ class ImageRepository:
     ) -> BoardImage | None:
         """Update board image position, transformations, z-order, or group."""
         board_image = await self.get_board_image(board_id, image_id)
-        
+
         if not board_image:
             return None