This is sqlite, not a db-server like mysql, its an in-process db that forgoes those sort of issues in the name of performance and lightness.
There's probably an extension for permissions in sqlite but out of the box the db files are plaintext (you need an extension for that).
Good starting point for extensions: https://antonz.org/sqlean/
SQLite only supports a single writer at a time, but does support concurrent reads. There is also an experimental branch that supports concurrent writes.