perf: batch user queries in schedules output service

[pedroccastro]

What does this PR do?

Fixes N+1 query pattern in organization and team schedule endpoints

Problem:

Both services were calling getResponseSchedule in a loop, which internally fetched user's default schedule ID one by one:

for (const schedule of schedules) {
  responseSchedules.push(await this.outputSchedulesService.getResponseSchedule(schedule));
  // ↳ internally calls: await this.usersRepository.getUserScheduleDefaultId(userId)
}

For an organization with 100 users, this means 100+ database round-trips.

Solution:

• Add getUsersScheduleDefaultIds batch method to UsersRepository
• Add getResponseSchedules batch method to OutputSchedulesService
• Extract transformScheduleToOutput for reuse and testability

Changes:

File	Change
users.repository.ts	Add getUsersScheduleDefaultIds batch method
output-schedules.service.ts	Add getResponseSchedules + extract transformScheduleToOutput
organizations-schedules.service.ts	Use batch method
teams-schedules.service.ts	Use batch method

Also removes dead code (formatInput method)

How should this be tested?

1. GET /v2/organizations/{orgId}/schedules — verify returns schedules correctly
2. GET /v2/teams/{teamId}/schedules — verify returns schedules correctly

No functional change, same response format, fewer queries.

Mandatory Tasks

• I have self-reviewed the code
• N/A - I have updated the developer docs in /docs if this PR makes changes that would require a documentation change
• N/A - Performance improvement, existing e2e tests cover functionality

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3 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
cal	Ignored		Dec 22, 2025 5:00pm
cal-companion	Ignored	Preview	Dec 22, 2025 5:00pm
cal-eu	Ignored		Dec 22, 2025 5:00pm

[cubic-dev-ai]

No issues found across 4 files

[github-actions]

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[ThyMinimalDev]

nice