Extension:GrowthExperiments/growthexperiments user impact table

mysql> describe growthexperiments_user_impact;
+----------------+------------------+------+-----+---------+-------+
| Field          | Type             | Null | Key | Default | Extra |
+----------------+------------------+------+-----+---------+-------+
| geui_user_id   | int(10) unsigned | NO   | PRI | NULL    |       |
| geui_timestamp | binary(14)       | NO   | MUL | NULL    |       |
| geui_data      | mediumblob       | NO   |     | NULL    |       |
+----------------+------------------+------+-----+---------+-------+