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xiaoen
9c72317b9b
In SetHistory and Compact, the JSONL file was rewritten before updating the meta file. If the process crashed between the two writes, the meta still had a large Skip value pointing past the now-shorter JSONL file, causing GetHistory to return empty — effectively data loss. Reverse the order: write meta (with Skip=0) first, then rewrite JSONL. On crash between the two writes, the old uncompacted file is still intact and GetHistory reads from line 1, returning stale-but-complete data. The next operation self-corrects.