// in EmploymentRecord.cs
[DBStorageParams("data source=database.db")]
public class EmploymentRecord : SQLiteStorageItem
{
    [DBColumn]
    private Guid _positionID;     // will save with "_positionID" column name 
    [DBColumn("YourCustomName")]  // will save with "YourCustomName" column name
    private Guid _personID;
    public Position Position { /* code here */ }
    public Person Person { /* code here */ }
    [DBColumn]
    public Decimal EmploymentValue;
    [DBColumn]
    public DateTime HireDate;
    [DBColumn]
    public DateTime FireDate;

    public EmploymentRecord(Position position, Person person, Decimal employmentValue,
                            DateTime hireDate, DateTime fireDate)
    {
        this.Position = position;
        this.Person = person;
        this.EmploymentValue = employmentValue;
        this.HireDate = hireDate;
        this.FireDate = fireDate;
    }
    
    // For internal library's usage
    private EmploymentRecord(object nothing) : base(null) { }
}

// in Program.cs or anywhere
static void Main(string[] args)
{
    DBStorageLib.Core.Init();
    
    // Your code
    // You can add as a static field to your class 
    SQLiteStorage storage = (SQLiteStorage)Core.GetStorage(typeof(EmploymentRecord));

    foreach (EmploymentRecord item in storage.Items.Values)
    {
            // Iterate over dictionary
    }

    // Get item by ID
    storage.GetItem(Guid.NewGuid());
    // or
    storage[Guid.NewGuid()];

    // end
    DBStorageLib.Core.Close();
}