The 'nedb' package is unmaintained (last update was 5 years ago) and
has a couple of high severity vulnerabilities.
In addition, the use of callbacks is somewhat cumbersome for
the project's current workflow.
Therefore, I've decided to replace it with the 'nedb-promises' package,
which, internally, makes use of a maintained fork of 'nedb' and
wraps its API with Promises.