Claude Code Automatically Deletes Local History

It has been confirmed that Claude Code includes a feature that automatically and permanently deletes local session records older than 30 days based on the default setting cleanupPeriodDays: 30. This operation is performed without warning when the application starts, and recovery is impossible as there is no trash bin or server-side backup.

How to Resolve

To change the history retention period, add the following setting to the ~/.claude/settings.json file.

{
  "cleanupPeriodDays": 3650
}

This issue has already been reported as a known problem via GitHub issues #62476, #64996, etc.