IM/backend/IM_API/Migrations/20260204150644_add-SequenceId.cs

using Microsoft.EntityFrameworkCore.Migrations;

#nullable disable

namespace IM_API.Migrations
{
    /// <inheritdoc />
    public partial class addSequenceId : Migration
    {
        /// <inheritdoc />
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "GroupMemberId",
                table: "messages");

            migrationBuilder.AddColumn<long>(
                name: "SequenceId",
                table: "messages",
                type: "bigint",
                nullable: false,
                defaultValue: 0L);
        }

        /// <inheritdoc />
        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropColumn(
                name: "SequenceId",
                table: "messages");

            migrationBuilder.AddColumn<int>(
                name: "GroupMemberId",
                table: "messages",
                type: "int(11)",
                nullable: true,
                comment: "若为群消息则表示具体的成员id");
        }
    }
}