Build a small write-ahead-logged key-value store and crash-test it

Append checksummed log records, flush on commit, replay on restart, then kill the process at random points and check that no acknowledged write is lost.

The exercise happens on Self-directed (design reference: SQLite documentation). Canonical link: https://www.sqlite.org/atomiccommit.html. Link check: link responded (5 Oct 2026). Opened from this app 0 times; opening is not counted as an attempt.

Supports: Durability reasoning for storage, low-level, distributed and database research roles.