Tracked in: #6157
Depends on: #6169

If the last entry in the mappings file is partial, truncate the file.

It can happen if we crash during flush. We must truncate the file so that newly appended mappings don't get corrupted.

I don't particularly like the implementation, but the tools here are a bit limited. An alternative approach would require to load the full file in memory, or it would require to read over the file twice, which is why I implemented the current approach instead.

Tasks

• Merge Mutable ID tracker: implement storage for point versions #6169
• Rebase on dev
• Undraft

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