messengerapi.Broker/code/MessengerBroker.Db.Sql.Migrator/DesignTimeDbContextFactory.cs

using Microsoft.EntityFrameworkCore.Design;

namespace MessengerBroker.Db.Sql.Migrator
{
    public partial class DesignTimeDbContextFactory : IDesignTimeDbContextFactory<BrokerSqlDbContext>
    {
        public BrokerSqlDbContext CreateDbContext(string[] args)
        {
            return new BrokerSqlDbContext(CONNECTION_STRING);
        }
    }
}