Calendar sync problems & confusing account settings

[xof.e]

I am trying to troubleshoot my calendar sync problems. I did not change any settings, but since a couple of weeks the calendar syncing has become unstable on my fairphone 3. If I enter events on the phone they don’t get transferred to the web-calendar on https://murena.io/apps/calendar/ and hence will not be synced to my thunderbird.

I went to account-settings to check for sync-settings. there I find the following accounts:
A. myemail@e.email (calendar-sync turned on, as well as tasks, notes and address-book, last synced 4 days ago)
B. contacts (myemail@e.email Hg) (turned on)
C. myemail@e.email VIA DAVX
D. Signal
E. Calendar-Abos, WebCalendarManager
F. WhatsApp

What I find confusing:

1. why is there a separate account (B)for contacts, if there already is an option to sync contacts in account (A) ?

2. Do I stilll need (C) the DavX5 account / the DavX4 App? I cannot remember if this is an essential system app or if it’s something I had installed 2 years ago when I had troubles syncing calendars

3. What on earth is (E) WebCalendarManager ???

4. Is there a simple way of troubleshooting calendar sync issues. I am really quite sure I never changed any settings and it suddenly stopped working.

I am grateful for any tipps.

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[tcecyk]

1. valid question. Technically they’re different types for accountmanager (née davx5), see:
   sqlite3 -line /data/system_de/0/accounts_de.db 'select * from accounts;'
   “e.foundation.webdav.eelo” vs “foundation.e.accountmanager.eelo.address_book”. I haven’t read the code, but suspect by looking at the setup process AM will create entries for each remote addressbook you have
2. not if you experience no bugs ? accountmanager == renamed davx5. They should be able to coexist though in theory.
3. that is to query web ical endpoints, different protocol that caldav. Should be part of am/davx
4. adb logcat mostly when you invoke the sync mechanism and see errors - there are on-device apps to do so too (search forum for logfox) - but I find debugging via usb more comfortable still

If i’d be you and not in a debug / bughunt mood, backup contacts in .vcf just in case, remove all dav* (a b c) accounts, remove davx5, re-setup. It resets probably file sync state, but it’s not destructive.

Edit: to be clear I simplified in 2. - accountmanager has code modifications to davx5 to ease the setup-wizard process