✨ Add docs and tests for Python 3.9 and Python 3.10 (#3712)

Co-authored-by: Thomas Grainger <tagrain@gmail.com>

docs_src/sql_databases/sql_app_py39/schemas.py

@@ -0,0 +1,37 @@
+from typing import Optional
+
+from pydantic import BaseModel
+
+
+class ItemBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+
+
+class ItemCreate(ItemBase):
+    pass
+
+
+class Item(ItemBase):
+    id: int
+    owner_id: int
+
+    class Config:
+        orm_mode = True
+
+
+class UserBase(BaseModel):
+    email: str
+
+
+class UserCreate(UserBase):
+    password: str
+
+
+class User(UserBase):
+    id: int
+    is_active: bool
+    items: list[Item] = []
+
+    class Config:
+        orm_mode = True