first commit

Models/TimeBankCardUsageLog.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    /// <summary>One deduction event against a TimeBankCard's balance — an append-only ledger so
+    /// MinutesRemaining is always auditable/reconstructable, the same reasoning as LedgerEntry
+    /// for money.</summary>
+    public class TimeBankCardUsageLog
+    {
+        [Key]
+        public Guid TimeBankCardUsageLogId { get; set; }
+
+        public Guid FKTimeBankCardId { get; set; }
+        [ForeignKey(nameof(FKTimeBankCardId))]
+        public TimeBankCard TimeBankCard { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey(nameof(FKClientId))]
+        public Client Client { get; set; }
+
+        // Which facility this swipe/use was against -- not a FacilitySession, since a time-bank
+        // card is spent on open-ended usage (e.g. "swim for however long"), not a fixed
+        // pre-booked slot the way Booking is.
+        public Guid FKFacilityId { get; set; }
+        [ForeignKey(nameof(FKFacilityId))]
+        public Facility Facility { get; set; }
+
+        public int MinutesDeducted { get; set; }
+        public int MinutesRemainingAfter { get; set; }
+
+        public DateTime UsedAt { get; set; } = DateTime.UtcNow;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    }
+}