fix: preserve manual task starts outside schedule windows

db/schema.sql

@@ -1071,6 +1071,7 @@ CREATE TABLE IF NOT EXISTS task_schedule_tasks (
     PRIMARY KEY (schedule_id, task_id)
 );
 ALTER TABLE tasks ADD COLUMN IF NOT EXISTS schedule_paused BOOLEAN NOT NULL DEFAULT false;
+ALTER TABLE tasks ADD COLUMN IF NOT EXISTS schedule_manual_until TIMESTAMPTZ;
 CREATE INDEX IF NOT EXISTS idx_task_schedule_tasks_task ON task_schedule_tasks(task_id);
 ALTER TABLE task_schedule_tasks ADD COLUMN IF NOT EXISTS paused_by_schedule BOOLEAN NOT NULL DEFAULT false;