consumer模块完成95%，在和商家端对接聊天购物闭环

sql/create_shop_follows.sql

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+-- create_shop_follows.sql
+-- Run this in Supabase SQL Editor
+
+CREATE TABLE IF NOT EXISTS public.ml_shop_follows (
+    id UUID DEFAULT gen_random_uuid() PRIMARY KEY,
+    user_id UUID NOT NULL REFERENCES auth.users(id) ON DELETE CASCADE,
+    shop_id UUID NOT NULL REFERENCES public.ml_shops(id) ON DELETE CASCADE, -- Assuming ml_shops.id is UUID
+    created_at TIMESTAMP WITH TIME ZONE DEFAULT timezone('utc'::text, now()) NOT NULL,
+    UNIQUE(user_id, shop_id)
+);
+
+-- Enable RLS
+ALTER TABLE public.ml_shop_follows ENABLE ROW LEVEL SECURITY;
+
+-- Policies
+CREATE POLICY "Users can view their own follows" 
+ON public.ml_shop_follows FOR SELECT 
+USING (auth.uid() = user_id);
+
+CREATE POLICY "Users can create their own follows" 
+ON public.ml_shop_follows FOR INSERT 
+WITH CHECK (auth.uid() = user_id);
+
+CREATE POLICY "Users can delete their own follows" 
+ON public.ml_shop_follows FOR DELETE 
+USING (auth.uid() = user_id);
+
+-- Optional: View count on shops
+-- You might want to add follower_count to ml_shops and use triggers to update it.