Mirrors the fix in postgresql-ha-staging.yaml: added
primary_slot_name: standby_leader_slot to both patroni-0 and patroni-1's
standby_cluster blocks so this file's specs stay byte-identical to
staging's, per this file's own "do not recreate the live promoted
primary/replica" design requirement. See postgresql-ha-staging.yaml
header and the ADR-0001 note for full incident detail.
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