When did event number 7 happen for user number -8022267440849930000?
event number refers to event_id; event_id = 7; user number refers to app_id; app_id = -8022267440849930000;
SELECT T1.timestamp FROM events_relevant AS T1 INNER JOIN app_events AS T2 ON T1.event_id = T2.event_id WHERE T2.app_id = -8022267440849930000 AND T1.event_id = 7