♻️ Edit refactor db models to use UUID's instead of integer ID's (#1259)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

backend/app/models.py

@@ -1,3 +1,5 @@
+import uuid
+
 from pydantic import EmailStr
 from sqlmodel import Field, Relationship, SQLModel
 
@@ -39,14 +41,14 @@ class UpdatePassword(SQLModel):
 
 # Database model, database table inferred from class name
 class User(UserBase, table=True):
-    id: int | None = Field(default=None, primary_key=True)
+    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
     hashed_password: str
     items: list["Item"] = Relationship(back_populates="owner")
 
 
 # Properties to return via API, id is always required
 class UserPublic(UserBase):
-    id: int
+    id: uuid.UUID
 
 
 class UsersPublic(SQLModel):
@@ -72,16 +74,16 @@ class ItemUpdate(ItemBase):
 
 # Database model, database table inferred from class name
 class Item(ItemBase, table=True):
-    id: int | None = Field(default=None, primary_key=True)
+    id: uuid.UUID = Field(default_factory=uuid.uuid4, primary_key=True)
     title: str = Field(max_length=255)
-    owner_id: int | None = Field(default=None, foreign_key="user.id", nullable=False)
+    owner_id: uuid.UUID = Field(foreign_key="user.id", nullable=False)
     owner: User | None = Relationship(back_populates="items")
 
 
 # Properties to return via API, id is always required
 class ItemPublic(ItemBase):
-    id: int
-    owner_id: int
+    id: uuid.UUID
+    owner_id: uuid.UUID
 
 
 class ItemsPublic(SQLModel):
@@ -102,7 +104,7 @@ class Token(SQLModel):
 
 # Contents of JWT token
 class TokenPayload(SQLModel):
-    sub: int | None = None
+    sub: str | None = None
 
 
 class NewPassword(SQLModel):