By: Michael Lynch <git@mtlynch.io>
Fix stale retention numbers in DESIGN.md DESIGN.md described a retention policy of 60-minute snapshots and 100 days of retention. litestream.yml has shipped 24-hour snapshots and roughly 1000 days of retention since the 0.5.x migration (commit c35fc57); the doc was never updated to match. The config's inline comment reads deliberate, so this fixes the doc rather than the config, and adds a line explaining that snapshots are full database copies so the number of retained copies is bounded by snapshot interval and retention together. Co-Authored-By: Claude <noreply@anthropic.com>