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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 12.0.2): 17.0.1
Operating system and version (eg, Ubuntu 17.04): Raspbian buster
Apache or nginx version (eg, Apache 2.4.25): nginx 1.14.2-2+deb10u1
PHP version (eg, 7.1): 7.3
The issue you are facing:
I am using an application (Devonthink) that accesses a Nextcloud folder via WebDAV. Everything works fine, the problem I have is that almost every request seems to create a new session and these sessions do not seem to expire. This way my oc_authtoken table collects a lot of entries, they all have last_activity==last_check and expires==0. Shouldn’t these sessions expire eventually if they’re not used any more?
Is this the first time you’ve seen this error? : y
Steps to replicate it:
- use DevonThink as WebDAV sync location
The output of your Nextcloud log in Admin > Logging: latest log lines are from update to 17.0.1
[updater] Info: \OC\Updater::resetLogLevel: Reset log level to Warning(2)
GET /core/ajax/update.php?requesttoken=xxxxxxxxxxxx
from x.x.x.x at 2019-11-15T12:20:40+00:00
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxxxxx',
'passwordsalt' => 'xxxxxxx',
'secret' => 'xxxxxx',
'trusted_domains' =>
array (
0 => 'domain.tld',
),
'datadirectory' => '/media/nextcloud',
'overwrite.cli.url' => 'https://domain.tld:port',
'dbtype' => 'mysql',
'version' => '17.0.1.1',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => 'xxxxxxx',
'logtimezone' => 'UTC',
'installed' => true,
'memcache.local' => '\\OC\\Memcache\\APCu',
'loglevel' => 2,
'mail_from_address' => 'systemmail',
'mail_smtpmode' => 'smtp',
'mail_domain' => 'domain.tld',
'mail_smtpauthtype' => 'LOGIN',
'mail_smtpauth' => 1,
'mail_smtpsecure' => 'tls',
'mail_smtphost' => 'smtp.server',
'mail_smtpport' => '587',
'mail_smtpname' => 'mail@domain',
'mail_smtppassword' => 'xxxxx',
'overwritehost' => 'domain.tld:port',
'theme' => '',
'maintenance' => false,
'trashbin_retention_obligation' => 'auto',
'updater.release.channel' => 'stable',
'mysql.utf8mb4' => true,
'updater.secret' => 'xxxxxx',
'session_lifetime' => 60 * 60 * 24,
);
The output of your Apache/nginx/system log in /var/log/____: error.log is empty.