Unwrapped Errors in `handle_post_request` Function Without Graceful Handling.

There is an issue in the code related to unwrapping errors without proper handling in the `handle_post_request` function. Specifically, when attempting to execute the `query_one` method to insert a new user into the database, if an error occurs, it directly unwraps it, which may result in a panic and termination of the program. It's essential to handle errors more gracefully and return an appropriate response in case of failure.