Restructured the project structure back to the way it was, there's no reasonable way to split the modules

src/NadekoBot/Db/Extensions/CurrencyTransactionExtensions.cs

@@ -0,0 +1,20 @@
+#nullable disable
+using LinqToDB.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore;
+using Nadeko.Bot.Db.Models;
+
+namespace NadekoBot.Db;
+
+public static class CurrencyTransactionExtensions
+{
+    public static Task<List<CurrencyTransaction>> GetPageFor(
+        this DbSet<CurrencyTransaction> set,
+        ulong userId,
+        int page)
+        => set.ToLinqToDBTable()
+            .Where(x => x.UserId == userId)
+            .OrderByDescending(x => x.DateAdded)
+            .Skip(15 * page)
+            .Take(15)
+            .ToListAsyncLinqToDB();
+}