[Table("prom_term", Schema = "demo")]
    public class PromTerm
    {
        [Key]
        [Column("promotion_terminal_id")]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }
        [Column("promotion_id")]
        public int Promotionld { get; set; }
        [ForeignKey("Promotionld")]
        public DbPromotion Promotion { get; set; }
        [Column("pos_terminal_id")]
        public string POSTerminalld { get; set; }
        [Column("retailer_name")]
        public string RetailerName { get; set; }
        [Column("promotion_report_period_id")]
        public int ReportPeriodld { get; set; }
        [ForeignKey("ReportPeriodId")]
        public PromReportPeriod RepoortPeriod { get; set; }
    }

    public class FamilyTeamSvcDbContext : DbContext
    {

        ...
        public DbSet<PromTerm> PromotionTerminals { get; set; }
    }

            using var ctx = new FamilyTeamSvcDbContext(options);
            var promoTerminals = new List<PromTerm>{
                    new PromTerm
                    {
                        POSTerminalId="777777", 
                        RetailerName="8888"
                    },
                    new PromTerm
                    {
                        POSTerminalId="333",
                        RetailerName="AAA"
                      },
                      new PromTerm
                    {
                        POSTerminalId="qqq",
                        RetailerName="AAA"
                    },
                    new PromTerm
                    {
                        POSTerminalId="qqq",
                        RetailerName="BBB"
                    }
                }
                ;
            promoTerminals.ForEach(x => {
                x.Promotionld = 1;
                x.ReportPeriodld = 2;
                //ctx.PromotionTerminals.Append(x);
                }
            );

            ctx.PromotionTerminals.AddRange(promoTerminals);