OPDS in php or populate metadata.db from filesystem

[skelos]

Hello,
I'm looking for a OPDS server in PHP and I found COPS (blog.slucas.fr/projects/calibre-opds-php-server/).
It appears great but there is limiited: It need data in metadata.db
And the only way I know for insert data into metadata.db is using calibre.

My idea is to populate metadata.db directly from filesystem using a PHP file doing same insert did from Calibre.

So, I call scheduled PHP page that see server filesystem looking for new author folder/books, It populate metadata.db filling right table with right data and COPS publish all catalog with new entries.

Do you know something like this? May be possible for you?