Run this code if you want to review the current content of your [__MigrationHistory] table!

DecodeMigrationHistory.cs

using System.IO;
using System.IO.Compression;
using System.Text;
using NUnit.Framework;
using System;

namespace Example
{
    [TestFixture]
    [Ignore("This is not a test. Run this code if you want to review the current content of your [__MigrationHistory] table!")]
    public class DecodeMigrationHistory
    {
        [Test]
        public void Show_Current_Edmx()
        {
            byte[] compressedModel = (byte[])Context.Execute(@"SELECT TOP 1 Model FROM [dbo].[__MigrationHistory] ORDER BY MigrationId DESC");
            byte[] uncompressed = DecompressGZip(compressedModel);
            string edmx = Encoding.UTF8.GetString(uncompressed);

            Console.WriteLine(edmx);
        }

        private static byte[] DecompressGZip(byte[] gzip)
        {
            using (var stream = new GZipStream(new MemoryStream(gzip), CompressionMode.Decompress))
            {
                const int size = 4096;
                byte[] buffer = new byte[size];

                using (var memory = new MemoryStream())
                {
                    int count;
                    do
                    {
                        count = stream.Read(buffer, 0, size);
                        if (count > 0)
                        {
                            memory.Write(buffer, 0, count);
                        }
                    }

                    while (count > 0);
                    return memory.ToArray();
                }
            }
        }
    }
}