Phase 1 Complete by Claude Code

backend/shared/exceptions.py

@@ -1 +1,20 @@
-# TODO: Custom error handlers
+from fastapi import HTTPException
+
+
+class AuthenticationError(HTTPException):
+    def __init__(self, detail: str = "Could not validate credentials"):
+        super().__init__(
+            status_code=401,
+            detail=detail,
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+
+class AuthorizationError(HTTPException):
+    def __init__(self, detail: str = "Insufficient permissions"):
+        super().__init__(status_code=403, detail=detail)
+
+
+class NotFoundError(HTTPException):
+    def __init__(self, resource: str = "Resource"):
+        super().__init__(status_code=404, detail=f"{resource} not found")