Describe the bug
I expect dog event post to work when given a related event ID; for example

dog event post --related_event_id 4 foo bar

should work. What it actually does is return

ERROR: Invalid JSON structure

To Reproduce
Steps to reproduce the behavior:

1. Post an event, and extract the event ID.
2. Post a second event and pass the first event ID as a related event
3. See error

Expected behavior
I would expect it to work and for the backend API to tie the two together.

Environment and Versions (please complete the following information):

• dog 0.46.0
• Python 3.11.2