id int(11) unsigned not_null auto_increment comment(Primary key - unique identifier)
rule_key varchar(100) not_null comment(Ex: promo_p1, margin_rate, featured_effectiveness)
old_value decimal(8,4) not_null comment(old rule adjustment)
new_value decimal(8,4) not_null comment(new rule adjustment)
delta decimal(8,4) not_null comment(mean between old and new rule adjustment)
sample_size int(11) not_null comment(Number of cycles analyzed)
avg_delta_score_y decimal(5,2) not_null comment(Observed mean Y-score)
date_created datetime not_null comment(rule adjustment date created)

--
primary id
idx_rule_key rule_key
idx_date_created date_created

##
engine innodb
character_set utf8mb4
collate utf8mb4_unicode_ci