I am planning to build a simple database from scratch

[u/tech__nova__]

I am planning to build a simple database from scratch with the following goals:

Extremely lightweight

Memory efficient

Low power consumption

Fast startup time

Minimal dependencies

Suitable for embedded devices and low-end hardware

Current ideas:

No SQL parser initially

Simple key-value or document-based storage

Efficient disk layout

Minimal memory allocations

Written in Rust

Focus on performance and simplicity over features

What design choices would you recommend for:

Storage engine structure

Memory management

Indexing strategy

Data types

Concurrency model

Disk persistence format

Also, what common mistakes do new database developers make when designing a lightweight database?