WIP

BudgetApp/Services/TransactionService.cs

@@ -220,6 +220,18 @@ public class TransactionService(ApplicationDbContext db)
         await _db.SaveChangesAsync();
     }
 
+    public async Task MarkAsPaidAsync(int id, string userId, bool isPaid = true)
+    {
+        var transaction = await _db.Transactions
+            .Include(t => t.Account)
+            .FirstOrDefaultAsync(t => t.Id == id && t.Account.UserId == userId);
+
+        if (transaction is null) return;
+
+        transaction.IsPaid = isPaid;
+        await _db.SaveChangesAsync();
+    }
+
     public async Task MaterializeRecurringTransactionsAsync(string userId, DateTime? windowEnd = null)
     {
         var recurringParents = await _db.Transactions