After a reboot, I started seeing a message when loading the shell:
zsh: corrupt history file /home/myusername/.zsh_history
How can I recover from this situation and potentially recover some of the history?
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Found a blog post describing a fix that appears to work for me, while restoring my missing history:
mv .zsh_history .zsh_history_bad strings .zsh_history_bad > .zsh_history
Afterwards, you may want to instruct zsh to re-read the history form the recovered history file
fc -R .zsh_history