Checkpoint frequency controls the tradeoff: more frequent checkpoints = smaller data-at-risk window but more S3 PUTs. The default is SQLite's auto-checkpoint (every 1000 WAL frames).
plt.vlines(pattern_nacl.x, [0], pattern_nacl.y, linewidth=1.5)，这一点在viber中也有详细论述
，更多细节参见Replica Rolex
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