Postgres sequences can be replicated.
In most cases, you will not need to replicate sequences, unless your slaves are not read-only, or if you want your slaves to be ready for failover. If you do decide to replicate them, just treat them like you would a table: add them to the goat table, gather them into relgroups, and associate them with one or more syncs.
If you are using a swap sync, the best practice is to not replicate sequences, but to make sure that they are different on both sides, such that an insert on database A will never conflict with an insert on database B. There are three general ways to do this:
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