Scalability of collections, documents

[tokarenko]

I am trying to create arangosearch view over all document collections for analytical purposes: get all documents in all collections for past few days. I hit 2048 collections limit of AQL query. I found that the limit is configurable since 3.10.7. Please advise on the following:

1. What is the upper bound for collections in DB/AQL query? I plan to have much more collections and scale them to represent actual points of data collection. Should I change layout and have one giant collection for all the documents? I would prefer to have many collections though.
2. Is there a limit on the number of documents in collection/query?