[Bug]: Many REPORT request to the user's scheduling inbox

[ChristophWurst]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github OR Nextcloud Community Forum (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

123.321.123.321 - - [10/Oct/2023:13:01:26 +0000] "REPORT /remote.php/dav/calendars/usr/inbox/ HTTP/1.1" 401 1231 "-" "iOS/17.0.3 (21A360) dataaccessd/1.0" 90183
123.321.123.321 - - [10/Oct/2023:13:01:26 +0000] "REPORT /remote.php/dav/calendars/usr/inbox/ HTTP/1.1" 207 52784 "-" "iOS/17.0.3 (21A360) dataaccessd/1.0" 554370
123.321.123.321 - - [10/Oct/2023:13:01:27 +0000] "REPORT /remote.php/dav/calendars/usr/inbox/ HTTP/1.1" 401 1193 "-" "iOS/17.0.3 (21A360) dataaccessd/1.0" 218993
123.321.123.321 - - [10/Oct/2023:13:01:27 +0000] "REPORT /remote.php/dav/calendars/usr/inbox/ HTTP/1.1" 207 68910 "-" "iOS/17.0.3 (21A360) dataaccessd/1.0" 1020281
123.321.123.321 - - [10/Oct/2023:13:01:28 +0000] "REPORT /remote.php/dav/calendars/usr/inbox/ HTTP/1.1" 401 1193 "-" "iOS/17.0.3 (21A360) dataaccessd/1.0" 249884

This increases the server load.

For one user we observed 72 of those REPORT requests.

Steps to reproduce

1. ???

Expected behavior

Normal load.

Installation method

None

Nextcloud Server version

27

Operating system

None

PHP engine version

None

Web server

None

Database engine version

None

Is this bug present after an update or on a fresh install?

None

Are you using the Nextcloud Server Encryption module?

None

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

No response

List of activated Apps

No response

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

No response