Is there a way to know if subscription was returned because of a relation change ? And to know what was the precedent relation ?

maybe you could use a new type/table for that

@nwmqpa I believe the general idea is the same as in graphcool, which is to use a dummy value: https://www.graph.cool/docs/reference/graphql-api/subscription-api-aip7oojeiv/#subscribing-to-relation-changes