Implement petition signature storage

supabase/migrations/20251024125608_c4917347-f205-4a51-82d8-0b6d8f9ec6ec.sql

@@ -0,0 +1,32 @@
+-- Create petition signatures table
+CREATE TABLE public.petition_signatures (
+  id UUID NOT NULL DEFAULT gen_random_uuid() PRIMARY KEY,
+  name TEXT NOT NULL,
+  email TEXT NOT NULL,
+  comment TEXT,
+  created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now()
+);
+
+-- Enable Row Level Security
+ALTER TABLE public.petition_signatures ENABLE ROW LEVEL SECURITY;
+
+-- Allow anyone to insert signatures (public petition)
+CREATE POLICY "Anyone can sign the petition"
+ON public.petition_signatures
+FOR INSERT
+TO anon, authenticated
+WITH CHECK (true);
+
+-- Allow anyone to view signatures and testimonies
+CREATE POLICY "Anyone can view signatures"
+ON public.petition_signatures
+FOR SELECT
+TO anon, authenticated
+USING (true);
+
+-- Create index for faster queries by date
+CREATE INDEX idx_petition_signatures_created_at 
+ON public.petition_signatures(created_at DESC);
+
+-- Enable realtime for live signature updates
+ALTER PUBLICATION supabase_realtime ADD TABLE public.petition_signatures;