initial chat options implementation

Core/Data/ChatOptionValue.cs

@@ -0,0 +1,38 @@
+#nullable enable
+
+using Microsoft.EntityFrameworkCore;
+using System.Text.Json.Serialization;
+using System.Text.Json;
+using System;
+
+namespace Kruzya.TelegramBot.Core.Data;
+
+[PrimaryKey(nameof(ChatId), nameof(OptionId))]
+public class ChatOptionValue
+{
+    public long ChatId { get; set; }
+    public string OptionId { get; set; }
+    public byte[] Value { get; set; }
+
+
+    public T GetValue<T>(T? defVal = default)
+    {
+        try
+        {
+            return JsonSerializer.Deserialize<T>(new ReadOnlySpan<byte>(Value));
+        }
+        catch (Exception)
+        {
+            return defVal;
+        }
+    }
+
+    public void SetValue<T>(T value)
+    {
+        Value = JsonSerializer.SerializeToUtf8Bytes(value, new JsonSerializerOptions
+        {
+            WriteIndented = false,
+            DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull
+        });
+    }
+}