Document backend API endpoints with comprehensive Google-style docstrings

.gitignore

@@ -18,4 +18,11 @@ copilot.log
 # Build artifacts  
 *.tsbuildinfo
 AGENTS.md
-.apm/compiled
+.apm/compiled
+
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python

backend/api/users.py

@@ -5,12 +5,125 @@
 
 @router.get("/users")
 async def get_users() -> List[dict]:
-    """Get all users."""
+    """Retrieve all users from the system.
+
+    This endpoint returns a list of all registered users in the system.
+    It is intended for administrative purposes and user management operations.
+
+    **Authentication:** None required (in production, should require admin authentication)
+
+    **Use Cases:**
+        - Admin dashboard user listing
+        - User management interfaces
+        - System auditing and reporting
+
+    Returns:
+        List[dict]: A list of user objects, where each user has:
+            - id (int): Unique identifier for the user
+            - name (str): Full name of the user
+            - email (str): Email address of the user
+
+        Example response:
+            [
+                {
+                    "id": 1,
+                    "name": "John Doe",
+                    "email": "john@example.com"
+                }
+            ]
+
+    HTTP Status Codes:
+        200 OK: Successfully retrieved user list
+        500 Internal Server Error: Unexpected server error
+
+    Security Considerations:
+        - In production, this endpoint should require authentication
+        - Should implement pagination for large datasets
+        - Consider GDPR implications when exposing user data
+        - Email addresses should be masked for non-admin users
+
+    Note:
+        This is a demonstration endpoint. In production:
+        - Implement proper authentication/authorization
+        - Add pagination support (limit, offset)
+        - Add filtering and sorting capabilities
+        - Mask sensitive data based on requester permissions
+    """
     return [{"id": 1, "name": "John Doe", "email": "john@example.com"}]
 
 @router.post("/users")
 async def create_user(user_data: dict) -> dict:
-    """Create a new user."""
+    """Create a new user in the system.
+
+    This endpoint creates a new user account with the provided information.
+    It performs basic validation and returns the created user object.
+
+    **Authentication:** None required (in production, should require appropriate permissions)
+
+    **Use Cases:**
+        - User registration
+        - Admin-created user accounts
+        - Bulk user imports
+
+    Args:
+        user_data (dict): User information for account creation. Required fields:
+            - email (str): User's email address (required, must be valid format)
+            - name (str): User's full name (optional)
+
+        Example request body:
+            {
+                "name": "Jane Doe",
+                "email": "jane@example.com"
+            }
+
+    Returns:
+        dict: The created user object containing:
+            - id (int): Newly assigned unique identifier
+            - name (str): User's full name
+            - email (str): User's email address
+
+        Example response:
+            {
+                "id": 2,
+                "name": "Jane Doe",
+                "email": "jane@example.com"
+            }
+
+    Raises:
+        HTTPException: 400 Bad Request
+            - When email field is missing from request body
+            - Detail: "Email is required"
+
+    HTTP Status Codes:
+        200 OK: User successfully created
+        400 Bad Request: Invalid request data (missing required fields)
+        409 Conflict: User with email already exists (not implemented)
+        422 Unprocessable Entity: Invalid data format
+        500 Internal Server Error: Unexpected server error
+
+    Security Considerations:
+        - Email validation should be more robust in production
+        - Implement rate limiting to prevent abuse
+        - Add CAPTCHA for public registration endpoints
+        - Sanitize all input to prevent injection attacks
+        - Hash passwords if authentication is implemented
+
+    GDPR Compliance:
+        - Obtain explicit consent before storing user data
+        - Implement data retention policies
+        - Provide mechanisms for data export and deletion
+        - Log user creation events for audit trail
+
+    Note:
+        This is a demonstration endpoint. In production:
+        - Implement proper input validation (email format, name length, etc.)
+        - Add password handling with secure hashing (bcrypt, argon2)
+        - Check for duplicate emails before creating user
+        - Use proper data models (Pydantic) instead of raw dict
+        - Store users in a database with proper error handling
+        - Send email verification for new accounts
+        - Implement proper authorization checks
+    """
     if not user_data.get("email"):
         raise HTTPException(status_code=400, detail="Email is required")
     return {"id": 2, "name": user_data["name"], "email": user_data["email"]}