const ExitCodeCommandFailure = 123
ExitCodeCommandFailure indicates that a given command failed due to internal errors or invalid input parameters.
GenInvID generates an invocation ID, made of the username, the current timestamp in a human-friendly format, and a random suffix.
This can be used to generate a random invocation ID, but the creator and creation time can be easily found.
Main is the main function of the rdb application.