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It's fairly challenging to write a KV database, and takes several years of development to get the balance right between performance and reliability and avoiding data loss. Maybe read through the documentation for RocksDB https://github.com/facebook/rocksdb/wiki/RocksDB-Overview and watch the video on why it was developed and that may give you an impression of what is involved.
Perhaps Rust has some nice crates that will assist your development, but you're going to have to evaluate whether their design decisions meet the needs of your design, especially if you want to handle powerloss without data loss whilst maintaining high performance. Here's an example of where a create chose design over performance https://github.com/launchbadge/sqlx/issues/2007
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- SQL query builders
- SeaQuery is a database agnostic runtime query builder for Rust. Questions and suggestions are welcome!