pg_subscription_rel
   The catalog 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.
  
Table 51.54. pg_subscription_rel Columns
| Name | Type | References | Description | 
|---|---|---|---|
srsubid | oid |  | Reference to subscription | 
srrelid | oid |  | Reference to relation | 
srsubstate | char | 
       State code:
       i = initialize,
       d = data is being copied,
       s = synchronized,
       r = ready (normal replication)
       | |
srsublsn | pg_lsn | 
       Remote LSN of the state change used for synchronization coordination
       when in s or r states,
       otherwise null
       |