The POST /api/settings handler previously wrote ALL settings on every
save — so saving just the Email section would overwrite timezone,
check interval, ntfy topic, etc. with defaults.
Now:
- DB: only UPSERT the keys that are in this specific request body
- process.env: only update env vars for the keys in this request
- .env file: read → patch touched keys → write (not a full rewrite)
Section-scoped saves from the UI no longer clobber unrelated settings.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
nmemmertandClaude Sonnet 4.6
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