To view the list of file types recognized by GoLand, go to Settings/Preferences (Ctrl+Alt+S) . If a file in your project is marked with the icon, it indicates that GoLand can't recognize it. In this case, you can register and configure a new file type.
Group of modules
DB data source. Also, DBMS-specific icons are used:
DB data source with the read-only status, e.g. for Derby.
DDL data source
Column with a primary key
Column with a foreign key
Column with an index
Stored procedure or function