Implement planned features

supabase/migrations/20251103003450_d88ec137-2cfb-446d-a28e-08a1a045b12c.sql

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+-- Phase 1: Add conflict resolution tracking
+CREATE TABLE IF NOT EXISTS public.conflict_resolutions (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  submission_id UUID NOT NULL REFERENCES public.content_submissions(id) ON DELETE CASCADE,
+  detected_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  resolved_by UUID REFERENCES auth.users(id) ON DELETE SET NULL,
+  resolution_strategy TEXT NOT NULL CHECK (resolution_strategy IN ('keep-mine', 'keep-theirs', 'reload', 'merge')),
+  conflict_details JSONB,
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW()
+);
+
+-- Add index for performance
+CREATE INDEX IF NOT EXISTS idx_conflict_resolutions_submission 
+ON public.conflict_resolutions(submission_id);
+
+CREATE INDEX IF NOT EXISTS idx_conflict_resolutions_detected_at 
+ON public.conflict_resolutions(detected_at DESC);
+
+-- Enable RLS
+ALTER TABLE public.conflict_resolutions ENABLE ROW LEVEL SECURITY;
+
+-- Policy: Moderators can view all conflict resolutions
+CREATE POLICY "Moderators can view conflict resolutions"
+ON public.conflict_resolutions
+FOR SELECT
+USING (
+  EXISTS (
+    SELECT 1 FROM public.user_roles
+    WHERE user_id = auth.uid()
+    AND role IN ('moderator', 'admin', 'superuser')
+  )
+);
+
+-- Policy: Moderators can insert conflict resolutions
+CREATE POLICY "Moderators can insert conflict resolutions"
+ON public.conflict_resolutions
+FOR INSERT
+WITH CHECK (
+  EXISTS (
+    SELECT 1 FROM public.user_roles
+    WHERE user_id = auth.uid()
+    AND role IN ('moderator', 'admin', 'superuser')
+  )
+  AND resolved_by = auth.uid()
+);
+
+-- Add index for notification deduplication performance (Phase 3)
+CREATE INDEX IF NOT EXISTS idx_notification_logs_dedup 
+ON public.notification_logs(user_id, idempotency_key, created_at);
+
+-- Add comment
+COMMENT ON TABLE public.conflict_resolutions IS 'Tracks resolution of concurrent edit conflicts in moderation system';