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Sequence synchronization requires the page_lsn field returned by pg_get_sequence_data(), which was added in PostgreSQL 19. Previously, requesting sequence synchronization against an older publisher (via ALTER SUBSCRIPTION ... REFRESH SEQUENCES or by running ALTER SUBSCRIPTION ... CONNECTION on a disabled subscription with sequences in the INIT state and subsequently enabling the subscription) would cause the sequence synchronization worker to repeatedly fail with a confusing "invalid query response" error. Check the publisher's server version up front in both AlterSubscription_refresh_seq() and copy_sequences(), and error out immediately when it predates PostgreSQL 19. Also document the PostgreSQL 19 publisher requirement for sequence replication in the logical replication documentation and in ALTER SUBSCRIPTION ... REFRESH SEQUENCES. Reported-by: Noah Misch <noah@leadboat.com> Author: vignesh C <vignesh21@gmail.com> Reviewed-by: Shveta Malik <shveta.malik@gmail.com> Reviewed-by: Hayato Kuroda <kuroda.hayato@fujitsu.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Backpatch-through: 19 Discussion: https://postgr.es/m/20260710045217.f0.noahmisch@microsoft.com