MySQL tables data and traccar

Hello, I have connected trackar aplication to the MySQL database. I have also connected and registered one tracker, which sends position and fills the database. Though, it created two tables that remains empty: "data" and "traccar". What are they for? Thanks for any replies

• data - table for messages without GPS info (currently not supported)
• traccar - table to check that schema is create, it the next version it would also contain schema version