first commit

Models/FacilitySession.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    /// <summary>One scheduled, bookable occurrence of a Facility (e.g. "Pool, Tue 6-7pm").
+    /// Capacity is enforced by counting non-cancelled Bookings against this row, not by a
+    /// denormalized counter, to avoid drift between the two.</summary>
+    public class FacilitySession
+    {
+        [Key]
+        public Guid FacilitySessionId { get; set; }
+
+        public Guid FKFacilityId { get; set; }
+        [ForeignKey(nameof(FKFacilityId))]
+        public Facility Facility { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey(nameof(FKClientId))]
+        public Client Client { get; set; }
+
+        public DateTime StartTime { get; set; }
+        public DateTime EndTime { get; set; }
+
+        /// <summary>Overrides Facility.DefaultCapacity when set; null = use the facility default.</summary>
+        public int? Capacity { get; set; }
+
+        public bool IsCancelled { get; set; } = false;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+        public virtual ICollection<Booking> Bookings { get; set; }
+    }
+}