✨ Stickers & packs api

DysonNetwork.Sphere/Sticker/StickerService.cs

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+using DysonNetwork.Sphere.Storage;
+using Microsoft.EntityFrameworkCore;
+
+namespace DysonNetwork.Sphere.Sticker;
+
+public class StickerService(AppDatabase db, FileService fs)
+{
+    public async Task<Sticker> CreateStickerAsync(Sticker sticker)
+    {
+        db.Stickers.Add(sticker);
+        await db.SaveChangesAsync();
+        
+        await fs.MarkUsageAsync(sticker.Image, 1);
+
+        return sticker;
+    }
+
+    public async Task<Sticker> UpdateStickerAsync(Sticker sticker, CloudFile? newImage)
+    {
+        if (newImage != null)
+        {
+            await fs.MarkUsageAsync(sticker.Image, -1);
+            sticker.Image = newImage;
+            await fs.MarkUsageAsync(sticker.Image, 1);
+        }
+
+        db.Stickers.Update(sticker);
+        await db.SaveChangesAsync();
+
+        return sticker;
+    }
+
+    public async Task DeleteStickerAsync(Sticker sticker)
+    {
+        db.Stickers.Remove(sticker);
+        await db.SaveChangesAsync();
+        await fs.MarkUsageAsync(sticker.Image, -1);
+    }
+    
+    public async Task DeleteStickerPackAsync(StickerPack pack)
+    {
+        var stickers = await db.Stickers
+            .Include(s => s.Image)
+            .Where(s => s.PackId == pack.Id)
+            .ToListAsync();
+    
+        var images = stickers.Select(s => s.Image).ToList();
+        
+        db.Stickers.RemoveRange(stickers);
+        db.StickerPacks.Remove(pack);
+        await db.SaveChangesAsync();
+        
+        await fs.MarkUsageRangeAsync(images, -1);
+    }
+}