SQLITE EFcore saving value

Hi, i'm working on a project which have a SQLITE database. I'm using EFcore to managed it. I want to know if there is a way to automatically add/remove/update by tracking or idk all the variable in my list Widths.
Basically i want to call a methods

Save

Save

that will add thickness if not added or add/remove/update elements in width a if thickness i already in the database.

public class Thickness
{
    #region Properties
    [Key]
    public long Id { get; set; }

    [Required]
    public long MaterialId { get; set; }

    [Required]
    public double Value { get; set; }

    public List<Width> Widths { get; set; } = new List<Width>();
}

public class Thickness
{
    #region Properties
    [Key]
    public long Id { get; set; }

    [Required]
    public long MaterialId { get; set; }

    [Required]
    public double Value { get; set; }

    public List<Width> Widths { get; set; } = new List<Width>();
}

[Table("Width")]
public class Width
{
    #region Properties
    [Key]
    public long Id { get; set; }

    [Required]
    public long ThicknessId { get; set; }

    [Required]
    public double Value { get; set; }
}

[Table("Width")]
public class Width
{
    #region Properties
    [Key]
    public long Id { get; set; }

    [Required]
    public long ThicknessId { get; set; }

    [Required]
    public double Value { get; set; }
}

SQLITE EFcore saving value

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