diff --git a/invest/serializers.py b/invest/serializers.py
index 8fef76d..b99f380 100644
--- a/invest/serializers.py
+++ b/invest/serializers.py
@@ -58,40 +58,6 @@ class AIUpdateSerializer(serializers.Serializer):
 
 
 
-class TransactionSerializer(serializers.ModelSerializer):
-    action_display = serializers.CharField(source='get_action_display', read_only=True)
-
-    class Meta:
-        model = Transaction
-        fields = [
-            'id', 'portfolio', 'action', 'action_display',
-            'stock_code', 'quantity', 'price_per_share', 'date',
-            'created_at',
-        ]
-        read_only_fields = ['id', 'created_at']
-
-
-class PortfolioSerializer(serializers.ModelSerializer):
-    stocks = StockSerializer(many=True, read_only=True)
-
-    class Meta:
-        model = Portfolio
-        fields = ['id', 'name', 'created_at', 'stocks']
-        read_only_fields = ['id', 'created_at']
-
-
-class PortfolioListSerializer(serializers.ModelSerializer):
-    stock_count = serializers.SerializerMethodField()
-
-    class Meta:
-        model = Portfolio
-        fields = ['id', 'name', 'created_at', 'stock_count']
-        read_only_fields = ['id', 'created_at']
-
-    def get_stock_count(self, obj):
-        return obj.stocks.count()
-
-
 # --------------------------------------------------------------------------+
 # Holdings (with real-time prices)                                          |
 # -------------------------------------------------------------------------+
@@ -116,22 +82,6 @@ class PortfolioHoldingsSerializer(serializers.Serializer):
     total_pnl_pct = serializers.FloatField()
 
 
-# --------------------------------------------------------------------------+
-# AI Update                                                                 |
-# -------------------------------------------------------------------------+
-
-class AIHoldingInputSerializer(serializers.Serializer):
-    stock_code = serializers.CharField()
-    quantity = serializers.FloatField()
-    avg_cost = serializers.FloatField(required=False, default=0.0)
-
-
-class AIUpdateSerializer(serializers.Serializer):
-    portfolio_id = serializers.IntegerField()
-    holdings = AIHoldingInputSerializer(many=True)
-    reset = serializers.BooleanField(default=False)
-
-
 class AIUpdateResultSerializer(serializers.Serializer):
     stock_code = serializers.CharField()
     quantity = serializers.FloatField()