Add reusable geofences migration 5.sql

migrations/5.sql

@@ -0,0 +1,10 @@
+ALTER TABLE `instance` ADD COLUMN `geofence` varchar(255) DEFAULT NULL;
+
+CREATE TABLE IF NOT EXISTS `geofence` (
+    `name` varchar(255),
+    `type` enum('circle','geofence') NOT NULL,
+    `data` longtext NOT NULL,
+    PRIMARY KEY ('name')
+);
+
+-- TODO: foreign key constraint on update on delete etc for instances/geofences