first commit

Models/ClientPackage.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace Fitness_core_BE.Models
+{
+    public class ClientPackage
+{
+
+        [Key]
+        public Guid ClientPackageId { get; set; }
+        public string? PackageName { get; set; }
+        public string? PackageDescription { get; set; }
+        public decimal PackagePrice { get; set; }
+
+        // Platform (HexaFitness -> gym) billing formula for this plan.
+        // baseFee = MinimumMonthlyBill + max(0, min(activeMembers, MaxBillableMemberCount) - IncludedMemberCount) * PerMemberRate,
+        // capped by MonthlyCap when set. PerMemberRate = 0 preserves legacy flat-PackagePrice behavior for existing rows.
+        public decimal PerMemberRate { get; set; } = 0;
+        public decimal MinimumMonthlyBill { get; set; } = 0;
+        public decimal? MonthlyCap { get; set; }
+        public decimal SetupFee { get; set; } = 0;
+
+        // Members already covered by MinimumMonthlyBill before PerMemberRate overage kicks in.
+        public int IncludedMemberCount { get; set; } = 0;
+        // Optional ceiling on the member count billed for (null = unlimited).
+        public int? MaxBillableMemberCount { get; set; }
+
+        // Platform's cut of a client's own member-billing, depending on which gateway
+        // (the client's own, or HexaFitness's) their member payments route through.
+        public decimal OwnGatewayFeePercent { get; set; } = 0;
+        public decimal OwnGatewayFeeFixed { get; set; } = 0;
+        public decimal OurGatewayFeePercent { get; set; } = 0;
+        public decimal OurGatewayFeeFixed { get; set; } = 0;
+
+        // Day of month (1-28) the client is paid out on, for clients on their own gateway.
+        public int PayoutDayOfMonth { get; set; } = 1;
+
+        // The plan applied to a client when it has no active ClientSubscription assignment.
+        // Only one row should have IsDefault = true.
+        public bool IsDefault { get; set; } = false;
+
+        public bool IsActive { get; set; } = true;
+        public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+
+
+    }
+}