Check if the checkpoint seq is in the WAL boundary before using

[git-hulk]

This closes #1319

[git-hulk]

This boundary check looks necessary but I can't reproduce this issue on my side.

[torwig]

LGTM

[git-hulk]

@torwig @caipengbo I extended the sequence limitation to require the checkpoint sequence must be greater or equal to the WAL sequence instead of strictly matching.

  if (seq < wal_seq) {
    return {Status::NotOK, fmt::format("checkpoint seq: {} is smaller than the WAL seq: {}", seq, wal_seq)};
  }

And I have tested if this check works correctly on my side.

[git-hulk]

Thanks all, merging...