listUsageRecords for backup usage (type 28) isn't returning the backup storage usage

[yadvr]

problem

listUsageRecords for backup usage (type 28) isn't returning the backup storage usage

    {
      "account": "admin",
      "accountid": "d7cde215-82fa-11ed-b2b0-525400110090",
      "description": "Backup usage of size 24 Hrs for VM dl-yadavcloud (6aa02af7-9782-4b08-8270-a35aea4849ca) and backup offering NAS Backup Offering (4abcf42c-356f-44e4-a477-ba3cf75c40cc, user ad-hoc/scheduled backup allowed: true)",
      "domain": "ROOT",
      "domainid": "b13960b9-82fa-11ed-b2b0-525400110090",
      "domainpath": "ROOT",
      "enddate": "2026-01-22T23:59:59+0530",
      "name": "i-2-1231-VM",
      "rawusage": "24",
      "startdate": "2026-01-22T00:00:00+0530",
      "tags": [],
      "usage": "24 Hrs",
      "usageid": "6aa02af7-9782-4b08-8270-a35aea4849ca",
      "usagetype": 28,
      "virtualmachineid": "6aa02af7-9782-4b08-8270-a35aea4849ca",
      "zoneid": "323a3a13-7758-4042-98fc-e165da1b139c"
    },

versions

ACS 4.22 with NAS B&R

The steps to reproduce the bug

1. Create backups
2. Ensure usage is enabled and running
3. Check the listUsageRecords after some time (day+)
   ...

What to do about it?

The API must return the backup usage and not just the usage time (hours).

[yadvr]

cc @harikrishna-patnala @sureshanaparti @weizhouapache @abh1sar