feat: add pg_cron migration for multi-step pipeline schedules

Adds 002_cron_schedules.sql with idempotent schedules for:
- ingest-daily (10:00 UTC)
- check-research (every 5 min)
- check-renders (every 5 min)
- sponsor-outreach (Mon/Thu 09:00 UTC)

Uses DO blocks for safe unschedule on re-runs.

Co-authored-by: research <research@miriad.systems>

Author: Miriad

supabase/migrations/002_cron_schedules.sql

@@ -0,0 +1,104 @@
+-- ==========================================================================
+-- pg_cron schedules for CodingCat.dev automated video pipeline
+-- ==========================================================================
+--
+-- Prerequisites:
+--   These Supabase config vars must be set before running this migration:
+--     ALTER DATABASE postgres SET app.site_url = 'https://your-vercel-url.vercel.app';
+--     ALTER DATABASE postgres SET app.cron_secret = 'your-cron-secret-here';
+--
+--   You can set them in the Supabase dashboard under Database → Extensions,
+--   or via SQL in the SQL Editor.
+--
+-- Pipeline flow:
+--   1. ingest-daily     → discovers trends, creates Sanity doc (status: "researching" or "script_ready")
+--   2. check-research   → polls NotebookLM, enriches script, transitions to "script_ready"
+--   3. check-renders    → audio gen → Remotion render → upload → publish
+--   4. sponsor-outreach → automated sponsor discovery + outreach emails
+-- ==========================================================================
+
+-- Enable required extensions
+CREATE EXTENSION IF NOT EXISTS pg_cron;
+CREATE EXTENSION IF NOT EXISTS pg_net;
+
+-- ---------------------------------------------------------------------------
+-- Remove any existing schedules (idempotent re-runs)
+-- ---------------------------------------------------------------------------
+-- pg_cron's unschedule() throws if the job doesn't exist, so we use DO blocks
+DO $$
+BEGIN
+  PERFORM cron.unschedule('ingest-daily');
+EXCEPTION WHEN OTHERS THEN
+  NULL;
+END $$;
+
+DO $$
+BEGIN
+  PERFORM cron.unschedule('check-research');
+EXCEPTION WHEN OTHERS THEN
+  NULL;
+END $$;
+
+DO $$
+BEGIN
+  PERFORM cron.unschedule('check-renders');
+EXCEPTION WHEN OTHERS THEN
+  NULL;
+END $$;
+
+DO $$
+BEGIN
+  PERFORM cron.unschedule('sponsor-outreach');
+EXCEPTION WHEN OTHERS THEN
+  NULL;
+END $$;
+
+-- ---------------------------------------------------------------------------
+-- Schedule: Ingest — daily at 10:00 UTC
+-- ---------------------------------------------------------------------------
+SELECT cron.schedule(
+  'ingest-daily',
+  '0 10 * * *',
+  $$SELECT net.http_get(
+    url := current_setting('app.site_url') || '/api/cron/ingest',
+    headers := jsonb_build_object('Authorization', 'Bearer ' || current_setting('app.cron_secret'))
+  )$$
+);
+
+-- ---------------------------------------------------------------------------
+-- Schedule: Check Research — every 5 minutes
+-- Polls NotebookLM for docs in "researching" status
+-- ---------------------------------------------------------------------------
+SELECT cron.schedule(
+  'check-research',
+  '*/5 * * * *',
+  $$SELECT net.http_get(
+    url := current_setting('app.site_url') || '/api/cron/check-research',
+    headers := jsonb_build_object('Authorization', 'Bearer ' || current_setting('app.cron_secret'))
+  )$$
+);
+
+-- ---------------------------------------------------------------------------
+-- Schedule: Check Renders — every 5 minutes
+-- Polls Remotion render status, uploads completed videos
+-- ---------------------------------------------------------------------------
+SELECT cron.schedule(
+  'check-renders',
+  '*/5 * * * *',
+  $$SELECT net.http_get(
+    url := current_setting('app.site_url') || '/api/cron/check-renders',
+    headers := jsonb_build_object('Authorization', 'Bearer ' || current_setting('app.cron_secret'))
+  )$$
+);
+
+-- ---------------------------------------------------------------------------
+-- Schedule: Sponsor Outreach — Mon/Thu at 09:00 UTC
+-- ---------------------------------------------------------------------------
+SELECT cron.schedule(
+  'sponsor-outreach',
+  '0 9 * * 1,4',
+  $$SELECT net.http_get(
+    url := current_setting('app.site_url') || '/api/cron/sponsor-outreach',
+    headers := jsonb_build_object('Authorization', 'Bearer ' || current_setting('app.cron_secret'))
+  )$$
+);