[DPE-7882] fix(logical-replication): track replication chains and guard the publisher (3/5) - #268
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…rd the publisher (3/5) Publications now carry replication-chains metadata recording the app path a table's data took, and the offer side refuses to publish a table it is subscribed to from the requester: direct A <-> B loops on the same table and multi-hop A -> B -> C -> A loops both surface as publisher errors the subscriber can act on. The create-publication branch moves into _create_new_publication to keep _process_offer under the complexity budget.
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Issue
Third PR of the logical replication migration series (after #267): the publisher-side guard for cyclic replication, part of fixing canonical/postgresql-operator#1085.
Solution
replication-chainsmetadata recording the app path a table's data took (built from our own subscription's chains, extended when republishing).A <-> Bloops on the same table and multi-hopA -> B -> C -> Aloops both surface as publisher errors on the relation, which the subscriber side (next PR) turns into a blocked status._create_new_publicationto keep_process_offerunder the complexity budget.Checklist