Understand sample readiness

For calendar, shift, and equipment runtime frequencies, the MES middleware maintenance service sets a sample to the Ready status by moving future samples from the sample_to_go and sample_char_link_to_go tables to the sample and sample_char_link tables. This happens when the current time (in UTC) is greater than or equal to the requested_time_utc in the sample_to_go table.

For production unit count frequencies, samples will either be pushed further into the future or will be skipped based on the system parameter setting Sample wait time for delayed production.