barkman/barkmanAPI/barkDbModel.cs

using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;

public class BarkContext : DbContext
{
    public DbSet<InventoryItems> Inventory  { get; set; }
    
    public string DbPath { get; }

    public BarkContext()
    {
        var folder = Environment.SpecialFolder.LocalApplicationData;
        var path = Environment.GetFolderPath(folder);
        DbPath = "./app.db";
    }

    // The following configures EF to create a Sqlite database file in the
    // special "local" folder for your platform.
    protected override void OnConfiguring(DbContextOptionsBuilder options)
        => options.UseSqlite($"Data Source={DbPath}");
}

public class InventoryItems
{
    public int Id {get; set;} 
    public string Name { get; set; }
    public string Brand { get; set; }
    public string? SerialNumber { get; set; }
    public string?  Status { get; set; }
    public float? RentalPrice { get; set; }
    public float? ReplacementCost { get; set; }
    public string? Notes { get; set; }
}