✨ Add created_at field to User and Item models and update endpoints (#2144)

backend/app/models.py

@@ -1,9 +1,15 @@
 import uuid
+from datetime import datetime, timezone
 
 from pydantic import EmailStr
+from sqlalchemy import DateTime
 from sqlmodel import Field, Relationship, SQLModel
 
 
+def get_datetime_utc() -> datetime:
+    return datetime.now(timezone.utc)
+
+
 # Shared properties
 class UserBase(SQLModel):
     email: EmailStr = Field(unique=True, index=True, max_length=255)
@@ -43,12 +49,17 @@ class UpdatePassword(SQLModel):
 class User(UserBase, table=True):
     id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
     hashed_password: str
+    created_at: datetime | None = Field(
+        default_factory=get_datetime_utc,
+        sa_type=DateTime(timezone=True),  # type: ignore
+    )
     items: list["Item"] = Relationship(back_populates="owner", cascade_delete=True)
 
 
 # Properties to return via API, id is always required
 class UserPublic(UserBase):
     id: uuid.UUID
+    created_at: datetime | None = None
 
 
 class UsersPublic(SQLModel):
@@ -75,6 +86,10 @@ class ItemUpdate(ItemBase):
 # Database model, database table inferred from class name
 class Item(ItemBase, table=True):
     id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
+    created_at: datetime | None = Field(
+        default_factory=get_datetime_utc,
+        sa_type=DateTime(timezone=True),  # type: ignore
+    )
     owner_id: uuid.UUID = Field(
         foreign_key="user.id", nullable=False, ondelete="CASCADE"
     )
@@ -85,6 +100,7 @@ class Item(ItemBase, table=True):
 class ItemPublic(ItemBase):
     id: uuid.UUID
     owner_id: uuid.UUID
+    created_at: datetime | None = None
 
 
 class ItemsPublic(SQLModel):