Disabling sequential scans is generally reliable. It sets the planner cost of seq_scan excessively high, so the planner will only choose it if there's no other

Disabling sequential scans is generally reliable. It sets the planner cost of seq_scan excessively high, so the planner will only choose it if there's no other choice (at least, that's been my experience). Of course, if your query is complex enough to trigger GEQO that might not work out.