While nothing critical is stored in cache directories by tt-rss nor do files have easily guessable names, you may consider forbidding external access over HTTP to these directories anyway. This is not required, however.
You may also consider restricting access to config.php
,
just in case.
location /tt-rss/cache {
deny all;
}
location = /tt-rss/config.php {
deny all;
}
<Directory /var/www/html/tt-rss/cache>
all denied
Require</Directory>
<Directory /var/www/html/tt-rss>
<Files "config.php">
all denied
Require</Files>
</Directory>