Refactor code for improved readability and consistency

- Cleaned up whitespace and formatting across multiple files for better readability.

app/models/user_oauth.py

@@ -14,43 +14,50 @@ if TYPE_CHECKING:
 
 class UserOAuth(db.Model):
     """Model for storing user's connected OAuth providers."""
-    
+
     __tablename__ = "user_oauth"
-    
+
     id: Mapped[int] = mapped_column(primary_key=True)
-    
+
     # User relationship
     user_id: Mapped[int] = mapped_column(ForeignKey("users.id"), nullable=False)
-    
+
     # OAuth provider information
     provider: Mapped[str] = mapped_column(String(50), nullable=False)
     provider_id: Mapped[str] = mapped_column(String(255), nullable=False)
-    
+
     # Provider-specific user information
     email: Mapped[str] = mapped_column(String(255), nullable=False)
     name: Mapped[str] = mapped_column(String(255), nullable=False)
     picture: Mapped[Optional[str]] = mapped_column(Text, nullable=True)
-    
+
     # Timestamps
     created_at: Mapped[datetime] = mapped_column(
         DateTime, default=datetime.utcnow, nullable=False
     )
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False
+        DateTime,
+        default=datetime.utcnow,
+        onupdate=datetime.utcnow,
+        nullable=False,
     )
-    
+
     # Unique constraint on provider + provider_id combination
     __table_args__ = (
-        db.UniqueConstraint("provider", "provider_id", name="unique_provider_user"),
+        db.UniqueConstraint(
+            "provider", "provider_id", name="unique_provider_user"
+        ),
     )
-    
+
     # Relationships
-    user: Mapped["User"] = relationship("User", back_populates="oauth_providers")
-    
+    user: Mapped["User"] = relationship(
+        "User", back_populates="oauth_providers"
+    )
+
     def __repr__(self) -> str:
         """String representation of UserOAuth."""
         return f"<UserOAuth {self.email} ({self.provider})>"
-    
+
     def to_dict(self) -> dict:
         """Convert oauth provider to dictionary."""
         return {
@@ -63,25 +70,29 @@ class UserOAuth(db.Model):
             "created_at": self.created_at.isoformat(),
             "updated_at": self.updated_at.isoformat(),
         }
-    
+
     @classmethod
-    def find_by_provider_and_id(cls, provider: str, provider_id: str) -> Optional["UserOAuth"]:
+    def find_by_provider_and_id(
+        cls, provider: str, provider_id: str
+    ) -> Optional["UserOAuth"]:
         """Find OAuth provider by provider name and provider ID."""
-        return cls.query.filter_by(provider=provider, provider_id=provider_id).first()
-    
+        return cls.query.filter_by(
+            provider=provider, provider_id=provider_id
+        ).first()
+
     @classmethod
     def create_or_update(
-        cls, 
-        user_id: int, 
-        provider: str, 
-        provider_id: str, 
-        email: str, 
-        name: str, 
-        picture: Optional[str] = None
+        cls,
+        user_id: int,
+        provider: str,
+        provider_id: str,
+        email: str,
+        name: str,
+        picture: Optional[str] = None,
     ) -> "UserOAuth":
         """Create new OAuth provider or update existing one."""
         oauth_provider = cls.find_by_provider_and_id(provider, provider_id)
-        
+
         if oauth_provider:
             # Update existing provider
             oauth_provider.user_id = user_id
@@ -100,6 +111,6 @@ class UserOAuth(db.Model):
                 picture=picture,
             )
             db.session.add(oauth_provider)
-        
+
         db.session.commit()
-        return oauth_provider
+        return oauth_provider