consumer模块完成95%，在和商家端对接聊天购物闭环

sql/fix_shop_product_counts.sql

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+-- 1. Immediate Fix: Update all shop counts based on existing products
+-- Recalculate based on merchant_id link
+UPDATE public.ml_shops s
+SET product_count = (
+    SELECT count(*) 
+    FROM public.ml_products p 
+    WHERE p.merchant_id = s.merchant_id 
+    AND p.status = 1
+);
+
+-- 2. Permanent Fix: Create a Trigger to keep it updated automatically
+-- This ensures when you add/remove products in the future, the shop count updates
+
+CREATE OR REPLACE FUNCTION public.update_shop_product_count_trigger()
+RETURNS TRIGGER AS $$
+BEGIN
+    -- Update count for the merchant associated with the NEW product (on Insert/Update)
+    IF (TG_OP = 'INSERT' OR TG_OP = 'UPDATE') THEN
+        UPDATE public.ml_shops
+        SET product_count = (
+            SELECT count(*) 
+            FROM public.ml_products 
+            WHERE merchant_id = NEW.merchant_id 
+            AND status = 1
+        )
+        WHERE merchant_id = NEW.merchant_id;
+    END IF;
+
+    -- Update count for the merchant associated with the OLD product (on Delete/Update)
+    IF (TG_OP = 'DELETE' OR (TG_OP = 'UPDATE' AND OLD.merchant_id IS DISTINCT FROM NEW.merchant_id)) THEN
+        UPDATE public.ml_shops
+        SET product_count = (
+            SELECT count(*) 
+            FROM public.ml_products 
+            WHERE merchant_id = OLD.merchant_id 
+            AND status = 1
+        )
+        WHERE merchant_id = OLD.merchant_id;
+    END IF;
+
+    RETURN NULL;
+END;
+$$ LANGUAGE plpgsql SECURITY DEFINER;
+
+-- Drop trigger if exists to avoid error on multiple runs
+DROP TRIGGER IF EXISTS on_product_change_update_shop_count ON public.ml_products;
+
+-- Create the trigger
+CREATE TRIGGER on_product_change_update_shop_count
+AFTER INSERT OR UPDATE OR DELETE ON public.ml_products
+FOR EACH ROW
+EXECUTE FUNCTION public.update_shop_product_count_trigger();