Can you give some more information about what you're doing with your cloud infrastructure? Would be intrigued to hear about what you're running.
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The system is still pretty simple. The main cost is the storage for the blobs in the Dolt repos pushed to DoltHub. We use S3 for that. There is an API that receives pushes and writes any other metadata (user, permissions, etc) into an RDS instance that stores metadata for DoltHub. That instance is also used to cache some critical things. Then it's just a set of web servers and a GraphQL sitting on top serving our React app.