Create migration for community post notifications system

cgen-6028cf6607c14f558c8d3972d9c4b51c

supabase/migrations/20250120_add_community_notifications.sql

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+-- Notifications table for community activity
+CREATE TABLE IF NOT EXISTS public.community_notifications (
+  id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+  user_id uuid NOT NULL REFERENCES public.user_profiles(id) ON DELETE CASCADE,
+  actor_id uuid NOT NULL REFERENCES public.user_profiles(id) ON DELETE CASCADE,
+  post_id uuid REFERENCES public.community_posts(id) ON DELETE CASCADE,
+  collaboration_post_id uuid REFERENCES public.collaboration_posts(id) ON DELETE CASCADE,
+  notification_type TEXT NOT NULL, -- 'new_post', 'post_liked', 'post_commented', 'post_shared'
+  title TEXT NOT NULL,
+  description TEXT,
+  read BOOLEAN DEFAULT false,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT now(),
+  CHECK (post_id IS NOT NULL OR collaboration_post_id IS NOT NULL)
+);
+
+-- Enable RLS
+ALTER TABLE public.community_notifications ENABLE ROW LEVEL SECURITY;
+
+-- Policies
+CREATE POLICY "community_notifications_read_own" ON public.community_notifications
+  FOR SELECT TO authenticated USING (user_id = auth.uid());
+
+CREATE POLICY "community_notifications_manage_own" ON public.community_notifications
+  FOR UPDATE TO authenticated USING (user_id = auth.uid()) WITH CHECK (user_id = auth.uid());
+
+CREATE POLICY "community_notifications_delete_own" ON public.community_notifications
+  FOR DELETE TO authenticated USING (user_id = auth.uid());
+
+-- Create indexes
+CREATE INDEX IF NOT EXISTS idx_community_notifications_user_id ON public.community_notifications(user_id);
+CREATE INDEX IF NOT EXISTS idx_community_notifications_actor_id ON public.community_notifications(actor_id);
+CREATE INDEX IF NOT EXISTS idx_community_notifications_post_id ON public.community_notifications(post_id);
+CREATE INDEX IF NOT EXISTS idx_community_notifications_collaboration_post_id ON public.community_notifications(collaboration_post_id);
+CREATE INDEX IF NOT EXISTS idx_community_notifications_read ON public.community_notifications(read);
+CREATE INDEX IF NOT EXISTS idx_community_notifications_created_at ON public.community_notifications(created_at DESC);
+
+-- Grant service role access
+GRANT SELECT, INSERT, UPDATE, DELETE ON public.community_notifications TO service_role;