Core_Be/Models/TimeBankCardUsageLog.cs

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;
    }
}