CRM/CoreActionLogcivicrm_action_logTable to store log for the reminder.3.4 id int unsigned true Number 3.4 id true contact_id int unsigned FK to Contact ID Contact 3.4 contact_id civicrm_contact id 3.4 CASCADE entity_id int unsigned true FK to id of the entity that the action was performed on. Pseudo - FK. 3.4 entity_table varchar 255 name of the entity table for the above id, e.g. civicrm_activity, civicrm_participant 3.4 entity_id entity_table 3.4 action_schedule_id int unsigned true FK to the action schedule that this action originated from. Schedule 3.4 action_schedule_id civicrm_action_schedule id 3.4 CASCADE action_date_time datetime date time that the action was performed on. 3.4 is_error boolean 0 true Was there any error sending the reminder? 3.4 message text Description / text in case there was an error encountered. 3.4 repetition_number int unsigned Keeps track of the sequence number of this repetition. 3.4 reference_date datetime NULL Stores the date from the entity which triggered this reminder action (e.g. membership.end_date for most membership renewal reminders) 4.6 5.17