Commit 44caf19

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feat: Zero-fill empty alert periods (#1340)

Closes HDX-2568 # Summary This PR adds zero-filling to alert evaluation, meaning that periods with no data returned in the alert query will be interpreted as a 0 value, which will (a) cause BELOW-threshold alerts to ALERT and (b) cause ABOVE-threshold alerts to auto-resolve. Grouped alerts do not have this behavior except when no group returns any data, since it is not always possible to know which groups should have data. A note about this behavior has been added to the UI. Groups are still auto-resolved (when appropriate) when the following period has no data for that group. <img width="773" height="460" alt="Screenshot 2025-11-10 at 8 53 05 AM" src="https://github.com/user-attachments/assets/82f6ced1-9bd1-41cd-832d-7bf8abb1253d" />

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.changeset
- weak-candles-invite.md
packages
- api/src/tasks/checkAlerts
  - __tests__
    - checkAlerts.test.ts
  - index.ts
- app/src
  - DBSearchPageAlertModal.tsx

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`‎.changeset/weak-candles-invite.md‎`

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 +"@hyperdx/api": patch
 +"@hyperdx/app": patch
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 +Zero-fill empty alert periods

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