README: Mention how to access collected data

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@@ -14,3 +14,12 @@ is the `mtaio` application from `terminal/src/mt-apps`.
 
 A more detailed documentation is available in [Jiří Matěják's Master
 thesis](https://dspace.cvut.cz/handle/10467/76276).
+
+## Collected data
+
+Data collected by the terminal are stored in an sqlite database on the
+rtime server. Users with SSH access to that server have read-only
+access to the database. For example, the whole database can be dumped
+with this command:
+
+    sqlite3 /home/coffee/coffee-flask/coffee.db .dump