Sparrow utilizes a PostgreSQL database. PostgreSQL is a powerful open-source relational database with a large community with resources and documentation. It can be useful to view and interact with Sparrow using a PostgreSQL client application that has a user interface for interacting and checking tables. Connecting to a local implementation of Sparrow is slightly easier, but a networked version is also possible.
Depending on the server setup, the following will allow you to login to your remote Sparrow instance and view the database. For a primer on creating SSH keys for servers, take a look at this tutorial.
Private Key:SSH-key for your server