deletePrefix

Deletes every document whose key begins with prefix, and returns how many.

val retired = store.deletePrefix(Key.of("session/2026-07/"))

deleteRange's contract in every respect — point deletes under one snapshot, atomic per batch and not overall, one tombstone per key, converging when called again — differing only in how the keys are chosen. See scanPrefix for why a prefix is named rather than spelled as a range, and Key.startsWith for why the range arithmetic a caller would otherwise write retires one key too many.

An empty prefix deletes every document, exactly as deleteRange() with no bounds does.

Parameters