increase speed of mysql when searching posts

Core/Service/Hash.cs

@@ -0,0 +1,21 @@
+using System.Security.Cryptography;
+using System.Text;
+
+namespace Kruzya.TelegramBot.Core.Service
+{
+    public class Hash
+    {
+        public string GenerateHash(string input)
+        {
+            var output = string.Empty;
+            var hashedBytes = SHA256.HashData(Encoding.UTF8.GetBytes(input));
+
+            foreach (var b in hashedBytes)
+            {
+                output += string.Format("{0,2:x2}", b);
+            }
+
+            return output;
+        }
+    }
+}

Core/Startup.cs

@@ -59,6 +59,8 @@ public class Startup
         services.AddScoped<IOptionProvider, DbOptionProvider>();
         services.AddHttpClient();
 
+        services.AddSingleton<Hash>();
+
         // Trigger module handlers.
         _core.Modules.ConfigureServices(services);
     }