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Append-Only Log

A data structure that only grows at the end — existing records are never modified or deleted — making it a natural record of an ordered history that can be replayed or audited. Databases, replication protocols, and blockchains all build on it.

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Append-Only Logs and Hash Indexes in Database Storage

An append-only log is an immutable storage abstraction in which writes are restricted to sequential appends, never in-place modification or deletion, and this immutability is what enables constant-ti…