template for service rather than hub

Previous template structure had direct handling of auth. This structure is designed to get auth from the hub instead.

src/exceptions.py

@@ -1,3 +1,28 @@
 """
 Global exceptions
-"""
+
+Exports:
+ - UnprocessableContentException
+ - ConflictException
+"""
+from typing import Optional
+
+from fastapi import HTTPException, status
+
+
+class UnprocessableContentException(HTTPException):
+	def __init__(self, message: Optional[str] = None) -> None:
+		detail = "Unprocessable content" if not message else message
+		super().__init__(
+			status_code=status.HTTP_422_UNPROCESSABLE_CONTENT,
+			detail=detail,
+		)
+
+
+class ConflictException(HTTPException):
+	def __init__(self, message: Optional[str] = None) -> None:
+		detail = "Conflict" if not message else message
+		super().__init__(
+			status_code=status.HTTP_409_CONFLICT,
+			detail=detail,
+		)