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This commit adds a new column, seq_sync_error_count, to the pg_stat_subscription_stats view. This counter tracks the number of errors encountered by the sequence synchronization worker during operation. Since a single worker handles the synchronization of all sequences, this value may reflect errors from multiple sequences. This addition improves observability of sequence synchronization behavior and helps monitor potential issues during replication. Author: Vignesh C <vignesh21@gmail.com> Reviewed-by: shveta malik <shveta.malik@gmail.com> Reviewed-by: Peter Smith <smithpb2250@gmail.com> Reviewed-by: Amit Kapila <amit.kapila16@gmail.com> Discussion: https://postgr.es/m/CAA4eK1LC+KJiAkSrpE_NwvNdidw9F2os7GERUeSxSKv71gXysQ@mail.gmail.com