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// scaffold for DbContext
public class MyDbContext: DbContext {
	public DbSet<DbModel_A> Model_As {get; set;}
  public DbSet<DbModel_B> Model_Bs {get; set;}
  
  public string DbPath {get;}
  
  // constructor
  public MyDbContext() {
    // add custom codes, e.g., config db file path
    DbPath = "myDbPath";
  }
  
  // config db path
  protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder) {
    optionsBuilder.UseSqlite($"Data Source={DbPath}");
  }
  
}