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setRemoteTrafficLocked merged last_online with MAX(last_online, ?), which is SQLite's two-argument scalar max. PostgreSQL's MAX() is aggregate-only, so node traffic sync failed every cycle with "function max(bigint, unknown) does not exist (SQLSTATE 42883)", flooding the logs. Add a dialect-aware database.GreatestExpr helper (GREATEST on Postgres, MAX on SQLite) and use it for the last_online merge. last_online is a non-null int64, so the two functions are semantically identical here. Closes #4633