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Neo4j or Recommendation System
To be honest every Backend as a Service Lacks Recommendation Systems we may use Graph Solution since, Appwrite has already support for GraphQL and Relations which makes it even more tempting
TL;DR
The user is asking about integrating Appwrite with a graph database for a recommendation system. They suggest using a combination of Appwrite and another service as no single product can solve everything. They mention that Appwrite lacks recommendation systems and suggest using a graph solution due to its support for GraphQL and relations. 
Usually one product can't be the solution for everything.
I do think that for example for your use case you may want to use combination of Appwrite with another service.
just like you can integrate appwrite with Meilisearch to supercharge searching, you can do the same connecting to a graph database
