[CORRUPTED] Synthetic Benchmark PR #25691 - Switched to time-based domain warmup

[tomerqodo]

Benchmark PR TryGhost#25691

Type: Corrupted (contains bugs)

Original PR Title: Switched to time-based domain warmup
Original PR Description: closes GVA-617
closes GVA-619

This uses the new domain warmup algorithm that makes the warmup static:

• The number of recipients we're targeting is 200,000
• The number of days in which the warmup takes place is 6 weeks (42 days)

This simplifies the flow considerably, and we can experiment with the exact thresholds to make sure this is effective for most users of domain warming.

---

Note

Replaces threshold-based scaling with a time-based exponential warmup from 200 to 200k over 42 days, with Infinity after completion, and updates tests accordingly.

• Email Service (DomainWarmingService.ts)
  • Replace threshold-based scaling table with time-based exponential warmup using WarmupVolumeOptions (start=200, end=200000, totalDays=42).
  • Add #getDaysSinceFirstEmail() querying first csd_email_count email (findPage with csd_email_count:-null, ordered by created_at ASC).
  • getWarmupLimit now computes limit via start * (end/start)^(day/(totalDays-1)) and returns Infinity once day >= totalDays.
• Tests
  • Integration and unit tests updated to validate time-based limits, day progression, same-day behavior, gaps, and post-warmup Infinity.
  • Introduce deterministic time control with fake timers and adjust assertions to new query and limits.

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Original PR URL: TryGhost#25691