feat:Initial commit

StoreService/Database/Entities/StoreCategory.cs

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+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Category grouping store items.
+/// </summary>
+public class StoreCategory
+{
+    #region Properties
+    public long Id { get; set; }
+    public string Title { get; set; } = string.Empty;
+    #endregion
+
+    #region Navigation
+    public ICollection<StoreItem> Items { get; set; } = new List<StoreItem>();
+    #endregion
+}
+

StoreService/Database/Entities/StoreDiscount.cs

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+using System.Diagnostics.CodeAnalysis;
+
+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Percentage discount that can apply to one or more store items within a time window.
+/// </summary>
+public class StoreDiscount
+{
+    #region Properties
+    public long Id { get; set; }
+    public decimal Percentage { get; set; }               // 0 - 100 (%)
+    public string? Description { get; set; }
+    public DateTime FromDate { get; set; }
+    public DateTime UntilDate { get; set; }
+    public bool IsCanceled { get; set; }
+    #endregion
+
+    #region Navigation
+    public ICollection<StoreDiscountItem> DiscountItems { get; set; } = new List<StoreDiscountItem>();
+    public ICollection<StoreOrderItemDiscount> OrderItemDiscounts { get; set; } = new List<StoreOrderItemDiscount>();
+    #endregion
+
+    #region Helpers
+    /// <summary>
+    /// Checks whether discount is active at provided moment (default: now) ignoring cancellation flag (if canceled returns false).
+    /// </summary>
+    public bool IsActive(DateTime? at = null)
+    {
+        if (IsCanceled) return false;
+        var moment = at ?? DateTime.UtcNow;
+        return moment >= FromDate && moment <= UntilDate;
+    }
+    #endregion
+}
+

StoreService/Database/Entities/StoreDiscountItem.cs

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+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Join entity linking discounts to store items.
+/// </summary>
+public class StoreDiscountItem
+{
+    #region Properties
+    public long Id { get; set; }
+    public long StoreDiscountId { get; set; }
+    public long StoreItemId { get; set; }
+    #endregion
+
+    #region Navigation
+    public StoreDiscount? Discount { get; set; }
+    public StoreItem? StoreItem { get; set; }
+    #endregion
+}
+

StoreService/Database/Entities/StoreItem.cs

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+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Store item with pricing and purchase rules.
+/// </summary>
+public class StoreItem
+{
+    #region Properties
+    public long Id { get; set; }
+    public long ItemId { get; set; }          // FK to external Item service (not modeled here)
+    public long StoreCategoryId { get; set; }  // FK to StoreCategory
+    public long? RankId { get; set; }          // Minimum rank required to buy (external system)
+    public int ManaBuyPrice { get; set; }
+    public int ManaSellPrice { get; set; }
+    public bool UnlimitedPurchase { get; set; }
+    public int InventoryLimit { get; set; }
+    #endregion
+
+    #region Navigation
+    public StoreCategory? Category { get; set; }
+    public ICollection<StoreDiscountItem> DiscountItems { get; set; } = new List<StoreDiscountItem>();
+    public ICollection<StoreOrderItem> OrderItems { get; set; } = new List<StoreOrderItem>();
+    #endregion
+}
+

StoreService/Database/Entities/StoreOrder.cs

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+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Represents a purchase order created by a user.
+/// </summary>
+public class StoreOrder
+{
+    #region Properties
+    public long Id { get; set; }
+    public long UserId { get; set; }
+    public DateTime CostUpdateDate { get; set; } = DateTime.UtcNow; // updated when prices recalculated
+    public DateTime? PaidDate { get; set; }  // when payment succeeded
+    public bool ItemsRedeemed { get; set; }  // becomes true once items granted to inventory
+    #endregion
+
+    #region Navigation
+    public ICollection<StoreOrderItem> OrderItems { get; set; } = new List<StoreOrderItem>();
+    #endregion
+}
+

StoreService/Database/Entities/StoreOrderItem.cs

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+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Item line inside an order with captured calculated price for history.
+/// </summary>
+public class StoreOrderItem
+{
+    #region Properties
+    public long Id { get; set; }
+    public long StoreOrderId { get; set; }
+    public long StoreItemId { get; set; }
+    public int CalculatedPrice { get; set; }
+    #endregion
+
+    #region Navigation
+    public StoreOrder? Order { get; set; }
+    public StoreItem? StoreItem { get; set; }
+    public ICollection<StoreOrderItemDiscount> AppliedDiscounts { get; set; } = new List<StoreOrderItemDiscount>();
+    #endregion
+}
+

StoreService/Database/Entities/StoreOrderItemDiscount.cs

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+namespace StoreService.Database.Entities;
+
+/// <summary>
+/// Captures which discounts were applied to order items at purchase time.
+/// </summary>
+public class StoreOrderItemDiscount
+{
+    #region Properties
+    public long Id { get; set; }
+    public long StoreOrderItemId { get; set; }
+    public long? StoreDiscountId { get; set; } // can be null if discount later removed but kept for history
+    #endregion
+
+    #region Navigation
+    public StoreOrderItem? OrderItem { get; set; }
+    public StoreDiscount? Discount { get; set; }
+    #endregion
+}
+