improve docstrings

Author: Jens Kürten

csfunctions/service/__init__.py

@@ -1,7 +1,18 @@
 from csfunctions.metadata import MetaData
+from csfunctions.service.base import Conflict, NotFound, Unauthorized, UnprocessableEntity
 from csfunctions.service.file_upload import FileUploadService
 from csfunctions.service.numgen import NumberGeneratorService
 
+__all__ = [
+    "Service",
+    "FileUploadService",
+    "NumberGeneratorService",
+    "Conflict",
+    "NotFound",
+    "Unauthorized",
+    "UnprocessableEntity",
+]
+
 
 class Service:
     """

csfunctions/service/file_upload.py

@@ -141,6 +141,11 @@ def upload_file_content(
             check_access: Whether to check access permissions.
             filesize: Size of the file in bytes (required only if the stream is not seekable).
             delete_derived_files: Whether to delete derived files after upload.
+
+        Raises:
+            csfunctions.service.Unauthorized: If access check fails.
+            csfunctions.service.Conflict: If the file is already locked.
+            csfunctions.service.NotFound: If the file object does not exist.
         """
         persno = persno or self.metadata.app_user
         if filesize is None:
@@ -197,6 +202,10 @@ def upload_new_file(
 
         Returns:
             The ID of the newly created file object.
+
+        Raises:
+            csfunctions.service.Unauthorized: If access check fails.
+            csfunctions.service.NotFound: If the parent object does not exist.
         """
         persno = persno or self.metadata.app_user
         file_object_id = self._create_new_file(