Is there (general) documentation available for the Web page Tag - Matomo database -interface? (A third party is doing auditing for an application, and they requested documentation for the database interface, obviously meaning that from the web tag, and mentioning Swagger).
I am not sure what exactly you are looking for:
Details about the tracking script:
The tracking API that Matomo uses to send the data from the browser to the server:
A (rough) summary on how the Matomo database is stuctured: