fix

api/app/routes/cards.py

@@ -115,4 +115,46 @@ async def get_unique_cards(db: AsyncSession = Depends(get_session)):
             "unique_id": str(uc.unique_id)
         }
         for uc in unique_cards
-    ]
+    ]
+
+
+@router.get("/stats")
+async def get_gacha_stats(db: AsyncSession = Depends(get_session)):
+    """
+    ガチャ統計情報を取得
+    """
+    try:
+        card_repo = CardRepository(db)
+        
+        # 総ガチャ実行数
+        total_draws = await card_repo.get_total_card_count()
+        
+        # レアリティ別カード数
+        cards_by_rarity = await card_repo.get_cards_by_rarity()
+        
+        # 成功率計算（簡易版）
+        success_rates = {}
+        if total_draws > 0:
+            for rarity, count in cards_by_rarity.items():
+                success_rates[rarity] = count / total_draws
+        
+        # 最近の活動（最新10件）
+        recent_cards = await card_repo.get_recent_cards(limit=10)
+        recent_activity = []
+        for card_data in recent_cards:
+            recent_activity.append({
+                "timestamp": card_data.get("obtained_at", "").isoformat() if card_data.get("obtained_at") else "",
+                "user_did": card_data.get("owner_did", "unknown"),
+                "card_name": f"Card #{card_data.get('card_id', 0)}",
+                "rarity": card_data.get("status", "common")
+            })
+        
+        return {
+            "total_draws": total_draws,
+            "cards_by_rarity": cards_by_rarity,
+            "success_rates": success_rates,
+            "recent_activity": recent_activity
+        }
+        
+    except Exception as e:
+        raise HTTPException(status_code=500, detail=f"Statistics error: {str(e)}")