Fix appName option and count billing events via dailyEvents

[Kuchizu]

Driver 3.x only accepts lowercase appname
Limiter now sums dailyEvents daily counters for full days and counts raw events/repetitions only for the partial day around lastChargeDate

[Copilot]

Pull request overview

This PR updates Mongo connection options for driver 3.x compatibility and refines limiter billing-period event counting by combining raw event scans for the “boundary day” with dailyEvents per-day counters for subsequent days.

Changes:

• Switch Mongo connection option from appName to appname for MongoDB driver 3.x compatibility.
• Update limiter DbHelper.getEventsCountByProject to count the partial boundary day via raw events/repetitions collections and sum later days via dailyEvents.
• Expand limiter DB helper tests to cover dailyEvents-based counting and boundary-day filtering.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
workers/limiter/tests/index.test.ts	Aligns mocked event timestamps with the boundary-day counting model.
workers/limiter/tests/dbHelper.test.ts	Adds dailyEvents mocking and new tests for boundary-day vs dailyEvents counting behavior.
workers/limiter/src/dbHelper.ts	Implements hybrid counting logic: raw scan for boundary day + aggregated dailyEvents for later days.
lib/db/controller.ts	Uses lowercase appname Mongo option key for driver 3.x support.

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[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.