Re: [External] Merging two database dumps

You can try one option, although just a thought in the air 😊

Use postgres FDW  ex. https://robots.thoughtbot.com/postgres-foreign-data-wrapper

Create foreign tables in the relevant server schema

And then union/union all  😊 or your custom constraint on the destination table where you dump the rows.

For ex.

You have server1, server2, server3

And you have server4 as your new single server.

You create FDW of server1, server2, server3 on server 4 and then import table into respective server schema.

server1.table1, server2.table1, server3.table1

and then

insert into server4.table1  select * from( select * from server1.table1 union select * from server2.table1 union select * from server3.table1) a;

something 😊

Thanks,

Vijay