--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/plugins/calendar/drivers/database/SQL/sqlite/2015022700.sql	Sat Jan 13 08:56:12 2018 -0500
@@ -0,0 +1,79 @@
+-- ALTER TABLE `events` ADD `instance` varchar(16) NOT NULL DEFAULT '' AFTER `uid`;
+-- ALTER TABLE `events` ADD `isexception` tinyint(3) NOT NULL DEFAULT '0' AFTER `instance`;
+-- ALTER TABLE `events` CHANGE `alarms` `alarms` TEXT NULL DEFAULT NULL;
+
+CREATE TABLE temp_events (
+  event_id integer NOT NULL PRIMARY KEY,
+  calendar_id integer NOT NULL default '0',
+  recurrence_id integer NOT NULL default '0',
+  uid varchar(255) NOT NULL default '',
+  created datetime NOT NULL default '1000-01-01 00:00:00',
+  changed datetime NOT NULL default '1000-01-01 00:00:00',
+  sequence integer NOT NULL default '0',
+  start datetime NOT NULL default '1000-01-01 00:00:00',
+  end datetime NOT NULL default '1000-01-01 00:00:00',
+  recurrence varchar(255) default NULL,
+  title varchar(255) NOT NULL,
+  description text NOT NULL,
+  location varchar(255) NOT NULL default '',
+  categories varchar(255) NOT NULL default '',
+  url varchar(255) NOT NULL default '',
+  all_day tinyint(1) NOT NULL default '0',
+  free_busy tinyint(1) NOT NULL default '0',
+  priority tinyint(1) NOT NULL default '0',
+  sensitivity tinyint(1) NOT NULL default '0',
+  status varchar(32) NOT NULL default '',
+  alarms varchar(255) default NULL,
+  attendees text default NULL,
+  notifyat datetime default NULL
+);
+
+INSERT INTO temp_events (event_id, calendar_id, recurrence_id, uid, created, changed, sequence, start, end, recurrence, title, description, location, categories, url, all_day, free_busy, priority, sensitivity, alarms, attendees, notifyat)
+                  SELECT event_id, calendar_id, recurrence_id, uid, created, changed, sequence, start, end, recurrence, title, description, location, categories, url, all_day, free_busy, priority, sensitivity, alarms, attendees, notifyat
+                  FROM events;
+
+DROP TABLE events;
+
+CREATE TABLE events (
+  event_id integer NOT NULL PRIMARY KEY,
+  calendar_id integer NOT NULL default '0',
+  recurrence_id integer NOT NULL default '0',
+  uid varchar(255) NOT NULL default '',
+  instance varchar(16) NOT NULL default '',
+  isexception tinyint(1) NOT NULL default '0',
+  created datetime NOT NULL default '1000-01-01 00:00:00',
+  changed datetime NOT NULL default '1000-01-01 00:00:00',
+  sequence integer NOT NULL default '0',
+  start datetime NOT NULL default '1000-01-01 00:00:00',
+  end datetime NOT NULL default '1000-01-01 00:00:00',
+  recurrence varchar(255) default NULL,
+  title varchar(255) NOT NULL,
+  description text NOT NULL,
+  location varchar(255) NOT NULL default '',
+  categories varchar(255) NOT NULL default '',
+  url varchar(255) NOT NULL default '',
+  all_day tinyint(1) NOT NULL default '0',
+  free_busy tinyint(1) NOT NULL default '0',
+  priority tinyint(1) NOT NULL default '0',
+  sensitivity tinyint(1) NOT NULL default '0',
+  status varchar(32) NOT NULL default '',
+  alarms text default NULL,
+  attendees text default NULL,
+  notifyat datetime default NULL,
+  CONSTRAINT fk_events_calendar_id FOREIGN KEY (calendar_id)
+    REFERENCES calendars(calendar_id)
+);
+
+INSERT INTO events (event_id, calendar_id, recurrence_id, uid, created, changed, sequence, start, end, recurrence, title, description, location, categories, url, all_day, free_busy, priority, sensitivity, alarms, attendees, notifyat)
+             SELECT event_id, calendar_id, recurrence_id, uid, created, changed, sequence, start, end, recurrence, title, description, location, categories, url, all_day, free_busy, priority, sensitivity, alarms, attendees, notifyat
+             FROM temp_events;
+
+DROP TABLE temp_events;
+
+-- Derrive instance columns from start date/time
+
+UPDATE events SET instance = strftime('%Y%m%d', start)
+ WHERE recurrence_id != 0 AND instance = '' AND all_day = 1;
+
+UPDATE events SET instance = strftime('%Y%m%dT%H%M%S', start)
+ WHERE recurrence_id != 0 AND instance = '' AND all_day = 0;