pg_subscription_rel contains the state for each replicated relation in each subscription. This is a many-to-many mapping.
This catalog only contains tables known to the subscription after running either
CREATE SUBSCRIPTION or
ALTER SUBSCRIPTION ... REFRESH PUBLICATION.
|Reference to subscription
|Reference to relation
i = initialize,
d = data is being copied,
s = synchronized,
r = ready (normal replication)
|Remote LSN of the state change used for synchronization coordination when in
r states, otherwise null
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