Is it possible to use a custom coveo index with Sitecore Hive components?
We heard there are challenges using Coveo for Sitecore Hive UI components with custom Coveo indexes. Are there any limitations using the REST endpoints for search/usage anaytics/push ?
Your use case is totally possible.
Coveo for Sitecore automatically manages your `master` and `web` indexes by detecting which database is being used by the current website.
So if you add another database, you would have to code your own wiring to detect whether you must output `coveo_master_products` or `coveo_web_products`.