[MilindChatrabhuji]

Overview

Fixes #5066

Problem

When syncing declarative task schedules where the task schedule definition omits an explicit timezone (e.g. schedules.task({ cron: "0 * * * *" })), task.schedule.timezone is undefined. Because the database model TaskSchedule defaults to "UTC", comparing existingSchedule.timezone ("UTC") against task.schedule.timezone (undefined) evaluated to true on every single deployment:

const timingChanged = existingSchedule.timezone !== task.schedule.timezone;

This falsely marked declarative schedules as modified on each deployment, triggering unnecessary database updates and unneeded schedule re-registrations.

Solution

• Normalized task and database timezones with a default "UTC" fallback before evaluating timingChanged and persistedValuesChanged:

  const taskTimezone = task.schedule.timezone ?? "UTC";
  const existingTimezone = existingSchedule.timezone ?? "UTC";
  const timezoneChanged = existingTimezone !== taskTimezone;

• Guaranteed "UTC" default normalization during schedule creation (task.schedule.timezone ?? "UTC") and quota checks (checkSchedule.call).
• Added comprehensive unit test in createBackgroundWorker.server.test.ts verifying that existing schedules and Redis jobs are preserved when a deployment schedule omits an explicit UTC timezone.

@algora-pbc /claim #5066

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.