Add Player leveling, item storage/consumption, stamina (#317)

DragaliaAPI.Database/ApiContext.cs

@@ -165,4 +165,6 @@ but EF Core doesn't like this and the client probably stops you anyway?
     public DbSet<DbPlayerEventPassive> PlayerEventPassives { get; set; }
 
     public DbSet<DbQuestClearPartyUnit> QuestClearPartyUnits { get; set; }
+
+    public DbSet<DbPlayerUseItem> PlayerUseItems { get; set; }
 }

DragaliaAPI.Database/Entities/DbPlayerItem.cs

@@ -0,0 +1,23 @@
+using DragaliaAPI.Shared.Definitions.Enums;
+using Microsoft.EntityFrameworkCore;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace DragaliaAPI.Database.Entities;
+
+[Index(nameof(DeviceAccountId))]
+[PrimaryKey(nameof(DeviceAccountId), nameof(ItemId))]
+public class DbPlayerUseItem : IDbHasAccountId
+{
+    /// <inheritdoc />
+    public virtual DbPlayer? Owner { get; set; }
+
+    /// <inheritdoc />
+    [ForeignKey(nameof(Owner))]
+    public required string DeviceAccountId { get; set; }
+
+    [Column("ItemId")]
+    public required UseItem ItemId { get; set; }
+
+    [Column("Quantity")]
+    public int Quantity { get; set; }
+}