Approve database migration

supabase/migrations/20251028173232_6a6d4761-ed51-47ff-b6ff-3531177ad7de.sql

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+-- Add email threading support to contact submissions
+ALTER TABLE contact_submissions 
+ADD COLUMN IF NOT EXISTS thread_id TEXT UNIQUE,
+ADD COLUMN IF NOT EXISTS last_admin_response_at TIMESTAMPTZ,
+ADD COLUMN IF NOT EXISTS response_count INTEGER DEFAULT 0;
+
+-- Generate thread_id for existing submissions
+UPDATE contact_submissions 
+SET thread_id = 'thread_' || id::text 
+WHERE thread_id IS NULL;
+
+-- Make thread_id NOT NULL after backfill
+ALTER TABLE contact_submissions 
+ALTER COLUMN thread_id SET NOT NULL;
+
+-- Create index
+CREATE INDEX IF NOT EXISTS idx_contact_submissions_thread_id 
+ON contact_submissions(thread_id);
+
+-- Create contact_email_threads table
+CREATE TABLE IF NOT EXISTS contact_email_threads (
+  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+  created_at TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+  submission_id UUID NOT NULL REFERENCES contact_submissions(id) ON DELETE CASCADE,
+  
+  -- Email metadata
+  message_id TEXT UNIQUE NOT NULL,
+  in_reply_to TEXT,
+  reference_chain TEXT[],
+  
+  -- Email content
+  from_email TEXT NOT NULL,
+  to_email TEXT NOT NULL,
+  subject TEXT NOT NULL,
+  body_text TEXT NOT NULL,
+  body_html TEXT,
+  
+  -- Direction & sender tracking
+  direction TEXT NOT NULL CHECK (direction IN ('inbound', 'outbound')),
+  sent_by UUID REFERENCES auth.users(id),
+  
+  -- Metadata
+  metadata JSONB DEFAULT '{}'::jsonb,
+  
+  CONSTRAINT valid_direction CHECK (
+    (direction = 'outbound' AND sent_by IS NOT NULL) OR
+    (direction = 'inbound' AND sent_by IS NULL)
+  )
+);
+
+-- Create indexes for performance
+CREATE INDEX IF NOT EXISTS idx_email_threads_submission ON contact_email_threads(submission_id);
+CREATE INDEX IF NOT EXISTS idx_email_threads_message_id ON contact_email_threads(message_id);
+CREATE INDEX IF NOT EXISTS idx_email_threads_created ON contact_email_threads(created_at DESC);
+CREATE INDEX IF NOT EXISTS idx_email_threads_direction ON contact_email_threads(direction);
+
+-- Enable RLS
+ALTER TABLE contact_email_threads ENABLE ROW LEVEL SECURITY;
+
+-- Admin-only read policy
+CREATE POLICY "Admins can view all email threads"
+  ON contact_email_threads FOR SELECT
+  TO authenticated
+  USING (has_role(auth.uid(), 'admin'::app_role));
+
+-- Admin-only write policy
+CREATE POLICY "Admins can insert email threads"
+  ON contact_email_threads FOR INSERT
+  TO authenticated
+  WITH CHECK (has_role(auth.uid(), 'admin'::app_role));
+
+-- Grant select to authenticated users (RLS will filter)
+GRANT SELECT ON contact_email_threads TO authenticated;
+GRANT INSERT ON contact_email_threads TO authenticated;
+
+-- Add comment for documentation
+COMMENT ON TABLE contact_email_threads IS 
+  'Stores email thread history for contact form submissions. Admin-only access.';