first commit

Models/SubscriptionMember.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    /// <summary>
+    /// Links a customer to a subscription. Every subscription has one IsPrimary row
+    /// (mirroring CustomerSubscription.FKCustomerId); group plans add more rows up to
+    /// the plan's MemberLimit. The primary row is never removed.
+    /// </summary>
+    public class SubscriptionMember
+    {
+        [Key]
+        public Guid SubscriptionMemberId { get; set; }
+
+        public Guid FKSubscriptionId { get; set; }
+        [ForeignKey("FKSubscriptionId")]
+        public virtual CustomerSubscription Subscription { get; set; }
+
+        // Tenant-bucket entity: this FK holds a TenantCustomerLinkId (not the central
+        // Customer.CusId directly) -- see Models/TenantCustomerLink.cs.
+        public Guid FKCustomerId { get; set; }
+        [ForeignKey("FKCustomerId")]
+        public virtual TenantCustomerLink TenantCustomerLink { get; set; }
+
+        public bool IsPrimary { get; set; }
+        public DateTime JoinedAt { get; set; } = DateTime.UtcNow;
+        public bool IsActive { get; set; } = true;
+
+        /// <summary>
+        /// Whether the member is currently *using* this plan. Unassigning clears this and
+        /// leaves IsActive alone, so the member keeps their row in the gym's member list
+        /// (and their access/device enrollment) and the same button can re-assign them.
+        /// IsActive stays reserved for a real removal, which does hide the row.
+        /// </summary>
+        public bool IsPlanAssigned { get; set; } = true;
+    }
+}