Trello link

Integration tests for Postgres Pubsub implementation only initially. Later we can see how easy it is to do the same for inmem pubsub impl and decide.

Cases:

• Get data sync server working with Postgres Pubsub implementation
• Client1 mutates stuff, client2 gets notified
• Hot reload + subscription server
• Magic publish
• Custom publish
• Client 1 connects to server1, client2 connects to server2, client1 executes a mutation on server1, client2 receives notification
• ...