CC-3036: Deleted Show instances reappear

-done.

airtime_mvc/build/sql/schema.sql

@@ -196,6 +196,7 @@ CREATE TABLE "cc_show_instances"
 	"instance_id" INTEGER,
 	"file_id" INTEGER,
 	"time_filled" TIME,
+	"deleted_instance" BOOLEAN default 'f' NOT NULL,
 	PRIMARY KEY ("id")
 );