Can't run all the different endpoints successfully

Nobody has claimed this yet.

I was able to:
- list all the todo items
- create a todo item

However, I got 5xx errors when doing at least:
- update a todo item
- delete a todo item
- show a todo item (don't remember if I did or not)

I think the documentation might be old, as the curl commands don't work out-of-the-box after replacing the placeholder `id` with the actual `id`. So I used Postman instead, which included the `application/json` in the header and it worked for listing todos and creating todos.

It seems like the resources are provisioned correctly since todo items are stored and retrieved from dynamodb. However, the other ones wouldn't.

What could be the reason?

Start by reproducing the update, delete, and show todo requests using the documented curl commands and Postman, comparing their headers and path parameters. Check the CRUD endpoint behavior and DynamoDB interactions to identify the source of the 5xx responses. Done means the cause is documented and the affected endpoints or curl examples work successfully.

Written by the indexing model from the issue text.