first commit

Models/CustomerTermsAcceptance.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    /// <summary>Records that a customer accepted a specific gym's specific Terms version —
+    /// e.g. at QR-join time. Kept even after the gym publishes a newer version.</summary>
+    public class CustomerTermsAcceptance
+    {
+        [Key]
+        public Guid CustomerTermsAcceptanceId { get; set; }
+
+        // Tenant-bucket entity: this FK holds a TenantCustomerLinkId (not the central
+        // Customer.CusId directly) -- see Models/TenantCustomerLink.cs.
+        public Guid FKCusId { get; set; }
+        [ForeignKey("FKCusId")]
+        public virtual TenantCustomerLink? TenantCustomerLink { get; set; }
+
+        public Guid FKClientId { get; set; }
+        [ForeignKey("FKClientId")]
+        public virtual Client? Client { get; set; }
+
+        public int Version { get; set; }
+        public DateTime AcceptedAt { get; set; } = DateTime.UtcNow;
+    }
+}