first commit

DTOs/CustomerPlan/UpdateCustomerPlanRequest.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Fitness_core_BE.DTOs.CustomerPlan
+{
+    public class UpdateCustomerPlanRequest
+    {
+        [Required]
+        public Guid CustomerPlanId { get; set; }
+
+        public string? PlanName { get; set; }
+
+        public string? PlanDescription { get; set; }
+
+        [Range(0, double.MaxValue, ErrorMessage = "Plan price must be a positive value")]
+        public decimal? PlanPrice { get; set; }
+
+        public bool? HasOnboardingFee { get; set; }
+
+        [Range(0, double.MaxValue, ErrorMessage = "Onboarding fee must be zero or greater")]
+        public decimal? OnboardingFeeAmount { get; set; }
+
+        [Range(1, int.MaxValue, ErrorMessage = "Duration must be at least 1 day")]
+        public int? DurationInDays { get; set; }
+
+        public string? PlanScope { get; set; }
+
+        public int? MemberLimit { get; set; }
+
+        public string? DurationMode { get; set; }
+
+        public DateTime? ValidFrom { get; set; }
+        public DateTime? ValidTo { get; set; }
+
+        public bool? AllowSplitPayments { get; set; }
+
+        public int? InstallmentCount { get; set; }
+
+        [Range(1, int.MaxValue, ErrorMessage = "SessionsPerCycle must be at least 1 when set")]
+        public int? SessionsPerCycle { get; set; }
+
+        public string? SessionRolloverPolicy { get; set; }
+
+        [Range(0, int.MaxValue, ErrorMessage = "RolloverGraceDays must be zero or greater")]
+        public int? RolloverGraceDays { get; set; }
+
+        public string? BillingTiming { get; set; }
+
+        public bool? IsActive { get; set; }
+
+        /// <summary>Replaces this plan's place set when provided (empty array clears it back
+        /// to unrestricted). Omit/null to leave the plan's places unchanged.</summary>
+        public List<Guid>? PlaceIds { get; set; }
+    }
+}