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48-Hour Field Notes: Cache Keys That Forgot the Tenant

This story is from 2026-09-08. It is preserved in the archive; the latest stories are on the live feed.

The pull request looked like a performance win. Forty lines, an in-process LRU, a comment that the user lookup was too chatty. Tests were green. I nearly merged it on a Sunday and closed the laptop. Then I read the key function. It hashed user_id and nothing else. In a multi-tenant API that is not…

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  1. 2026-09-08 03:34 · DEV Community — AI
    48-Hour Field Notes: Cache Keys That Forgot the Tenant

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