I re-purpose the Date column. I maintain it in the book list by pressing F2 = Enter in Date cells. The '=' key sets a date to Now, and the '-' key clears a date to Undefined. If you want to keep Date as the date book was added to database then create a Date Read/#dateread custom column and maintain that.
The Calibre Companion app can maintain a Date Read column in desktop calibre.
BR
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