Consider replacing subscriptions library due to limitation
Current pubsub mechanism relies on postgres notify which has a hard-limit of 8000 bytes (https://www.postgresql.org/docs/current/sql-notify.html). This makes broadcasting objects from server to client really tricky. We should consider switching to a different underlying library which will not be using postgres. This alternative could be based on redis or other technologies https://www.apollographql.com/docs/apollo-server/data/subscriptions#production-pubsub-libraries