- Database namespace is now NadekoBot.Db

- Db related code is now in src/NadekoBot/Db
- Finished major part of the db refactor, but many optimizations are left to be made

src/NadekoBot/Db/Models/CurrencyTransaction.cs

@@ -0,0 +1,16 @@
+namespace NadekoBot.Core.Services.Database.Models
+{
+    public class CurrencyTransaction : DbEntity
+    {
+        public long Amount { get; set; }
+        public string Reason { get; set; }
+        public ulong UserId { get; set; }
+
+        public CurrencyTransaction Clone() => new CurrencyTransaction
+        {
+            Amount = Amount,
+            Reason = Reason,
+            UserId = UserId,
+        };
+    }
+}