first commit

Models/LedgerEntry.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    // Manual/ad-hoc ledger line (e.g. rent, utilities, misc income) — a simple ledger for
+    // things not already captured elsewhere. The full P&L view merges these with derived
+    // entries from PaymentTransaction (member payments), ClientInvoice (platform fees) and
+    // StaffPayment (payroll), rather than duplicating those into this table.
+    public class LedgerEntry
+    {
+        [Key]
+        public Guid Id { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey("FKClientId")]
+        public virtual Client Client { get; set; }
+
+        public string EntryType { get; set; } = "Expense"; // "Income" | "Expense"
+        public string Category { get; set; } = "Other";
+        public string? Description { get; set; }
+        public decimal Amount { get; set; }
+        public DateTime EntryDate { get; set; } = DateTime.UtcNow;
+
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    }
+}