sync

Hi. First of all, kudos to you for the VFS cache - it's really brilliant. I have one request though.

For a little background, as of now I'm using the following settings:

--vfs-cache-mode full \
  --vfs-cache-max-size 500G \
  --vfs-cache-max-age 5000h \
  --vfs-cache-poll-interval 5m \
  --vfs-read-ahead 2G \
  --bwlimit-file 32M \
  --vfs-read-chunk-size=64M \
  --vfs-read-chunk-s

Hello, lately I can't successfully vdirsyncer sync my calendars because of a
database is locked error. Synchronization works fine with android's davdroid which talks with the same server.

Your vdirsyncer version: 0.16.4
If applicable, which server software (and which version) you're using: Nextcloud 13
Your Python version: 3.6.4
Your operating system: Arch linux
Relevant debug outpu

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