[help] Details about geofences table

mysql> desc geofences;
+-------------+---------------+
| Field       | Type          |
+-------------+---------------+
| id          | int(11)       |
| name        | varchar(128)  |
| description | varchar(128)  |
| area        | varchar(4096) |
| attributes  | varchar(4096) |
+-------------+---------------+

About geofences table, how is a geofence created? What value(s)/format are expected in the area column?

WKT format is expected.