Merging two databases

Hi there,

Is there a way of merging two databases in postgresql in the way of
differential replication? The thing is that we have two DBs with same
schemas and we want to merge the data within them into one single
replica. Are there any tools/ways of doing this? Of course when the
merged db is created it will be only updated/inserted with new data
from each of source DBs.

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Łukasz Brodziak