Function remove_file_if_exists 

pub fn remove_file_if_exists<P: AsRef<Path>>(path: P) -> Result<()>

Delete the file at path if it exists.

Used by Pager::close() to remove the WAL sidecar after a clean shutdown. Missing-file is intentionally not an error; the post-condition is “no file at path”, and that is satisfied either by deletion or by absence.

Errors

Returns Error::Io on any failure other than NotFound.