Choosing MongoDB collections structure for similar data structures?

I would probably keep one collection. In the case you do get another stat-type later, you don't have to re-architect your code around the new collection that you then have to be adding. You can search specifically on items where you have a specific type by creating an index on "type", but you can also search through all items because you have them all in a collection with an index on "timestamp".

(Please note that MongoDB also adds an _id field to every document, and to that one it will add an index too).

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