first commit

Models/CustomerWorkout.cs

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+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace Fitness_core_BE.Models
+{
+    public class CustomerWorkout
+    {
+        [Key]
+        public Guid CustomerWorkoutId { 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 Guid FKWorkoutPlanId { get; set; }
+        [ForeignKey("FKWorkoutPlanId")]
+        public virtual WorkoutPlan? WorkoutPlan { get; set; }
+        
+        public bool IsActive { get; set; } = true;
+        public DateTime AssignedDate { get; set; } = DateTime.UtcNow;
+        public DateTime? CompletedDate { get; set; }
+        public bool IsFollowing { get; set; } = false;
+        public string? Notes { get; set; }
+        public virtual ICollection<CustomerWorkoutExerciseCompletion> ExerciseCompletions { get; set; } = new List<CustomerWorkoutExerciseCompletion>();
+    }
+}