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View submission: Diamond Hands on the Data 💎🙌📈
To add to this, from Keyser's comment it sounds like they are using Cassandra, which is a NoSQL database that forgoes some of the consistency guarantees you get with an ACID compliant db ( like MySQL or Postgres) in favor of the ability to scale and to have your data replicated across multiple nodes in a cluster that can have nodes added and removed at will. A subset of data gets replicated to a subset of nodes in the cluster, making it more resilient to outages of a single node.
When the DB needs to scale, you can add another node to the cluster and the DB does the work of balancing your data and writing to the new node you added. The trade-off is that writes are not instantly consistent across all nodes, but reach a consistent state eventually.
There's nothing here!