feat(agenda): Epic 0 - Database schema for agenda module

- E0.S1: Add encounter_id and intake_id columns to reports table
- E0.S2: Add performance indices for reports and encounters
- E0.S3: Regenerate TypeScript types

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

supabase/migrations/20251202_add_encounter_intake_to_reports.sql

@@ -0,0 +1,52 @@
+-- ============================================================================
+-- Migration: Add encounter_id and intake_id columns to reports table
+-- Epic: E0 - Database & Types
+-- Story: E0.S1 - encounter_id toevoegen aan reports
+-- ============================================================================
+-- This migration adds bidirectional linking between reports and encounters/intakes
+-- allowing reports to be associated with specific appointments and intake sessions.
+-- ============================================================================
+
+-- Add encounter_id column
+-- Links reports to specific encounters (appointments)
+ALTER TABLE reports
+ADD COLUMN IF NOT EXISTS encounter_id UUID REFERENCES encounters(id) ON DELETE SET NULL;
+
+-- Add intake_id column
+-- Links reports to specific intake sessions
+ALTER TABLE reports
+ADD COLUMN IF NOT EXISTS intake_id UUID REFERENCES intakes(id) ON DELETE SET NULL;
+
+-- Add comments for documentation
+COMMENT ON COLUMN reports.encounter_id IS 'Link report to specific encounter/appointment (FHIR Encounter reference)';
+COMMENT ON COLUMN reports.intake_id IS 'Link report to specific intake session';
+
+-- ============================================================================
+-- Verification
+-- ============================================================================
+DO $$
+BEGIN
+  -- Check encounter_id column exists
+  IF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_name = 'reports' AND column_name = 'encounter_id'
+  ) THEN
+    RAISE NOTICE '✓ encounter_id column added to reports table';
+  ELSE
+    RAISE EXCEPTION 'encounter_id column not found in reports table';
+  END IF;
+
+  -- Check intake_id column exists
+  IF EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_name = 'reports' AND column_name = 'intake_id'
+  ) THEN
+    RAISE NOTICE '✓ intake_id column added to reports table';
+  ELSE
+    RAISE EXCEPTION 'intake_id column not found in reports table';
+  END IF;
+
+  RAISE NOTICE '============================================';
+  RAISE NOTICE 'Migration E0.S1 completed successfully';
+  RAISE NOTICE '============================================';
+END $$;