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Well that was just my hobby and side-gig... As part of my day jobs, I also worked on many projects with different databases including MySQL, Postgres, SQLite, MongoDB. I also implemented a side project (a distributed financial transaction processing system) using RethinkDB with per-table sharding and replication which runs on Kubernetes with statefulsets for persistence with automatic deployment and autoscaling and automatic database shard re-balancing with high availability with eventual consistency; I used a 2-phase commit algorithm for certain operations to achieve reliability in the event of write failure; as not to rely on atomic database transactions. I also did a course on relational database modeling at university (focused on ER diagrams and database normalization). I worked in the blockchain sector. I wrote a stateful, quantum-resistant blockchain from scratch including the cryptographic signature algorithm which uses an improved Lamport OTS variant suggested by Ralf Merkle and which uses a Merkle Signature Tree for key reuse and I contributed to the front end too. I also wrote a deterministic, fork-resistant, idempotent, heterogeneous multi-chain, chain-to-chain decentralized exchange. I also lead a team which wrote a P2P networking library with decentralized routing and efficient propagation of messages to peers belonging to the same subnets - Nodes in the network organized themselves into an unstructured, partial mesh topology with peer shuffling to avoid eclipse attacks but still retained the ability to form subnets based on the features they supported. But still, "a lot of data" a relative term.