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1. Fetch records from `medication_requests`, where:

   1. status = 'ACTIVE'

   2. dispense_valid_to < NOW()

2. Update status for all records:

   1. status  =  EXPIRED

   2. updated_by = SYSTEM_USER

   3. updated_at = timestamp

3. Write changes to audit log

4. Write changes to event manager

5. if the medication request is based on the activity with quantity:

   1. Recalculate and set remaining_quantity for the activity as described at Create Medication Request: Validate based_on (p. 2.d.1 )