IM_NEW/MessageService.Infrastructure/Migrations/20260913000100_ConversationActivityAndMessageSearch.cs

using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Migrations;

namespace MessageService.Infrastructure.Migrations
{
    [DbContext(typeof(MessageDbContext))]
    [Migration("20260913000100_ConversationActivityAndMessageSearch")]
    public partial class ConversationActivityAndMessageSearch : Migration
    {
        protected override void Up(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.AddColumn<DateTimeOffset>(
                name: "LastMessageTime",
                table: "conversations",
                type: "datetime(6)",
                nullable: true);

            migrationBuilder.Sql("""
                UPDATE `conversations` AS `conversation`
                SET `conversation`.`LastMessageTime` = COALESCE(
                    (
                        SELECT MAX(`message`.`CreationTime`)
                        FROM `messages` AS `message`
                        WHERE `message`.`StreamKey` = `conversation`.`StreamKey`
                          AND `message`.`IsDeleted` = 0
                    ),
                    `conversation`.`CreationTime`
                );
                """);

            migrationBuilder.CreateIndex(
                name: "IX_messages_StreamKey_MsgType_State_SequenceId",
                table: "messages",
                columns: new[] { "StreamKey", "MsgType", "State", "SequenceId" });
        }

        protected override void Down(MigrationBuilder migrationBuilder)
        {
            migrationBuilder.DropIndex(
                name: "IX_messages_StreamKey_MsgType_State_SequenceId",
                table: "messages");

            migrationBuilder.DropColumn(
                name: "LastMessageTime",
                table: "conversations");
        }
    }
}