PeriodKey in accounting_summary should be VARCHAR(255) not DATETIME

UPGRADING

+2011-10-14:
+	ALTER TABLE accounting_summary ADD COLUMN PeriodKey2 VARCHAR(255) AFTER PeriodKey;
+	UPDATE accounting_summary set PeriodKey2 = DATE_FORMAT(PeriodKey,'%Y-%m');
+	ALTER TABLE accounting_summary DROP COLUMN PeriodKey;
+	ALTER TABLE accounting_summary CHANGE COLUMN PeriodKey2 PeriodKey VARCHAR(255);
+	
+
 
 2011-03-22:
 	Add users_data table for various functions

database/core.tsql

@@ -256,7 +256,7 @@ CREATE TABLE @PREFIX@accounting_summary (
 
 	Username		VARCHAR(255),
 
-	PeriodKey		DATETIME,
+	PeriodKey		VARCHAR(255),
 
 	TotalSessionTime	@INT_UNSIGNED@,