diff --git a/supabase/migrations/20251107145022_1372b55c-d704-40e0-9660-1dcc72ce6b90.sql b/supabase/migrations/20251107145022_1372b55c-d704-40e0-9660-1dcc72ce6b90.sql
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+-- Phase 2: DATABASE INTEGRITY ENHANCEMENTS (CORRECTED)
+-- Add UNIQUE constraints, trigger-based validation, and date precision validation
+
+-- ============================================================================
+-- STEP 2.1: ADD MISSING UNIQUE CONSTRAINTS
+-- ============================================================================
+
+-- First, check for and remove duplicates before adding constraints
+-- Check parks.slug for duplicates
+DO $$
+DECLARE
+  duplicate_count INTEGER;
+BEGIN
+  SELECT COUNT(*) INTO duplicate_count
+  FROM (
+    SELECT slug, COUNT(*) as cnt
+    FROM parks
+    GROUP BY slug
+    HAVING COUNT(*) > 1
+  ) duplicates;
+  
+  IF duplicate_count > 0 THEN
+    RAISE WARNING 'Found % duplicate slugs in parks table. These must be resolved manually before adding UNIQUE constraint.', duplicate_count;
+  END IF;
+END $$;
+
+-- Check rides.slug for duplicates (per park)
+DO $$
+DECLARE
+  duplicate_count INTEGER;
+BEGIN
+  SELECT COUNT(*) INTO duplicate_count
+  FROM (
+    SELECT park_id, slug, COUNT(*) as cnt
+    FROM rides
+    GROUP BY park_id, slug
+    HAVING COUNT(*) > 1
+  ) duplicates;
+  
+  IF duplicate_count > 0 THEN
+    RAISE WARNING 'Found % duplicate slugs (per park) in rides table. These must be resolved manually before adding UNIQUE constraint.', duplicate_count;
+  END IF;
+END $$;
+
+-- Add UNIQUE constraint on parks.slug (globally unique)
+ALTER TABLE parks 
+  DROP CONSTRAINT IF EXISTS parks_slug_unique;
+
+ALTER TABLE parks 
+  ADD CONSTRAINT parks_slug_unique UNIQUE (slug);
+
+-- Add UNIQUE constraint on rides.slug (unique per park)
+ALTER TABLE rides 
+  DROP CONSTRAINT IF EXISTS rides_slug_park_unique;
+
+ALTER TABLE rides 
+  ADD CONSTRAINT rides_slug_park_unique UNIQUE (park_id, slug);
+
+-- Add UNIQUE constraint on companies.slug (globally unique)
+ALTER TABLE companies
+  DROP CONSTRAINT IF EXISTS companies_slug_unique;
+
+ALTER TABLE companies
+  ADD CONSTRAINT companies_slug_unique UNIQUE (slug);
+
+-- Add UNIQUE constraint on ride_models.slug (unique per manufacturer)
+ALTER TABLE ride_models
+  DROP CONSTRAINT IF EXISTS ride_models_slug_manufacturer_unique;
+
+ALTER TABLE ride_models
+  ADD CONSTRAINT ride_models_slug_manufacturer_unique UNIQUE (manufacturer_id, slug);
+
+-- ============================================================================
+-- STEP 2.2: ADD DATE PRECISION VALIDATION
+-- ============================================================================
+
+-- Create CHECK constraints for date_precision columns to ensure valid values
+-- Valid values: 'exact', 'month', 'year', 'decade', 'century', 'approximate'
+
+-- Parks table
+ALTER TABLE parks
+  DROP CONSTRAINT IF EXISTS parks_opening_date_precision_check;
+
+ALTER TABLE parks
+  ADD CONSTRAINT parks_opening_date_precision_check
+  CHECK (opening_date_precision IS NULL OR opening_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+ALTER TABLE parks
+  DROP CONSTRAINT IF EXISTS parks_closing_date_precision_check;
+
+ALTER TABLE parks
+  ADD CONSTRAINT parks_closing_date_precision_check
+  CHECK (closing_date_precision IS NULL OR closing_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Rides table
+ALTER TABLE rides
+  DROP CONSTRAINT IF EXISTS rides_opening_date_precision_check;
+
+ALTER TABLE rides
+  ADD CONSTRAINT rides_opening_date_precision_check
+  CHECK (opening_date_precision IS NULL OR opening_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+ALTER TABLE rides
+  DROP CONSTRAINT IF EXISTS rides_closing_date_precision_check;
+
+ALTER TABLE rides
+  ADD CONSTRAINT rides_closing_date_precision_check
+  CHECK (closing_date_precision IS NULL OR closing_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Companies table
+ALTER TABLE companies
+  DROP CONSTRAINT IF EXISTS companies_founded_date_precision_check;
+
+ALTER TABLE companies
+  ADD CONSTRAINT companies_founded_date_precision_check
+  CHECK (founded_date_precision IS NULL OR founded_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Park submissions
+ALTER TABLE park_submissions
+  DROP CONSTRAINT IF EXISTS park_submissions_opening_date_precision_check;
+
+ALTER TABLE park_submissions
+  ADD CONSTRAINT park_submissions_opening_date_precision_check
+  CHECK (opening_date_precision IS NULL OR opening_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+ALTER TABLE park_submissions
+  DROP CONSTRAINT IF EXISTS park_submissions_closing_date_precision_check;
+
+ALTER TABLE park_submissions
+  ADD CONSTRAINT park_submissions_closing_date_precision_check
+  CHECK (closing_date_precision IS NULL OR closing_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Ride submissions
+ALTER TABLE ride_submissions
+  DROP CONSTRAINT IF EXISTS ride_submissions_opening_date_precision_check;
+
+ALTER TABLE ride_submissions
+  ADD CONSTRAINT ride_submissions_opening_date_precision_check
+  CHECK (opening_date_precision IS NULL OR opening_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+ALTER TABLE ride_submissions
+  DROP CONSTRAINT IF EXISTS ride_submissions_closing_date_precision_check;
+
+ALTER TABLE ride_submissions
+  ADD CONSTRAINT ride_submissions_closing_date_precision_check
+  CHECK (closing_date_precision IS NULL OR closing_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Company submissions
+ALTER TABLE company_submissions
+  DROP CONSTRAINT IF EXISTS company_submissions_founded_date_precision_check;
+
+ALTER TABLE company_submissions
+  ADD CONSTRAINT company_submissions_founded_date_precision_check
+  CHECK (founded_date_precision IS NULL OR founded_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Timeline event submissions
+ALTER TABLE timeline_event_submissions
+  DROP CONSTRAINT IF EXISTS timeline_event_submissions_event_date_precision_check;
+
+ALTER TABLE timeline_event_submissions
+  ADD CONSTRAINT timeline_event_submissions_event_date_precision_check
+  CHECK (event_date_precision IS NULL OR event_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- Entity timeline events
+ALTER TABLE entity_timeline_events
+  DROP CONSTRAINT IF EXISTS entity_timeline_events_event_date_precision_check;
+
+ALTER TABLE entity_timeline_events
+  ADD CONSTRAINT entity_timeline_events_event_date_precision_check
+  CHECK (event_date_precision IS NULL OR event_date_precision IN ('exact', 'month', 'year', 'decade', 'century', 'approximate'));
+
+-- ============================================================================
+-- STEP 2.3: ADD TRIGGER-BASED FOREIGN KEY VALIDATION
+-- ============================================================================
+
+-- Create trigger function to validate submission_items.depends_on
+CREATE OR REPLACE FUNCTION validate_submission_item_dependency()
+RETURNS TRIGGER
+LANGUAGE plpgsql
+SECURITY DEFINER
+SET search_path = public
+AS $$
+BEGIN
+  -- If depends_on is not null, verify it references a valid item in same submission
+  IF NEW.depends_on IS NOT NULL THEN
+    IF NOT EXISTS (
+      SELECT 1 FROM submission_items
+      WHERE id = NEW.depends_on
+      AND submission_id = NEW.submission_id
+    ) THEN
+      RAISE EXCEPTION 'Invalid depends_on reference: item % not found in submission %', 
+        NEW.depends_on, NEW.submission_id;
+    END IF;
+    
+    -- Also prevent circular dependencies by checking order_index
+    IF EXISTS (
+      SELECT 1 FROM submission_items
+      WHERE id = NEW.depends_on
+      AND submission_id = NEW.submission_id
+      AND order_index >= NEW.order_index
+    ) THEN
+      RAISE EXCEPTION 'Circular dependency detected: dependent item must have lower order_index';
+    END IF;
+  END IF;
+  
+  RETURN NEW;
+END;
+$$;
+
+-- Drop trigger if exists and recreate
+DROP TRIGGER IF EXISTS validate_submission_item_dependency_trigger ON submission_items;
+
+CREATE TRIGGER validate_submission_item_dependency_trigger
+  BEFORE INSERT OR UPDATE ON submission_items
+  FOR EACH ROW
+  EXECUTE FUNCTION validate_submission_item_dependency();
+
+-- ============================================================================
+-- STEP 2.4: ADD DATA INTEGRITY CONSTRAINTS
+-- ============================================================================
+
+-- Ensure dates are logically consistent (opening before closing)
+ALTER TABLE parks
+  DROP CONSTRAINT IF EXISTS parks_dates_logical_check;
+
+ALTER TABLE parks
+  ADD CONSTRAINT parks_dates_logical_check
+  CHECK (closing_date IS NULL OR opening_date IS NULL OR opening_date <= closing_date);
+
+ALTER TABLE rides
+  DROP CONSTRAINT IF EXISTS rides_dates_logical_check;
+
+ALTER TABLE rides
+  ADD CONSTRAINT rides_dates_logical_check
+  CHECK (closing_date IS NULL OR opening_date IS NULL OR opening_date <= closing_date);
+
+-- Ensure ratings are in valid range (1-5)
+ALTER TABLE reviews
+  DROP CONSTRAINT IF EXISTS reviews_rating_range_check;
+
+ALTER TABLE reviews
+  ADD CONSTRAINT reviews_rating_range_check
+  CHECK (rating >= 1 AND rating <= 5);
+
+-- Ensure numeric fields are non-negative where applicable
+ALTER TABLE rides
+  DROP CONSTRAINT IF EXISTS rides_numeric_positive_check;
+
+ALTER TABLE rides
+  ADD CONSTRAINT rides_numeric_positive_check
+  CHECK (
+    (height_requirement IS NULL OR height_requirement >= 0)
+    AND (age_requirement IS NULL OR age_requirement >= 0)
+    AND (max_speed_kmh IS NULL OR max_speed_kmh >= 0)
+    AND (duration_seconds IS NULL OR duration_seconds >= 0)
+    AND (capacity_per_hour IS NULL OR capacity_per_hour >= 0)
+    AND (length_meters IS NULL OR length_meters >= 0)
+    AND (max_height_meters IS NULL OR max_height_meters >= 0)
+    AND (drop_height_meters IS NULL OR drop_height_meters >= 0)
+    AND (inversions IS NULL OR inversions >= 0)
+  );
+
+-- ============================================================================
+-- STEP 2.5: ADD INDEXES FOR PERFORMANCE
+-- ============================================================================
+
+-- Add indexes to improve query performance on foreign keys and frequently queried columns
+CREATE INDEX IF NOT EXISTS idx_parks_slug ON parks(slug);
+CREATE INDEX IF NOT EXISTS idx_rides_slug ON rides(park_id, slug);
+CREATE INDEX IF NOT EXISTS idx_companies_slug ON companies(slug);
+CREATE INDEX IF NOT EXISTS idx_ride_models_slug ON ride_models(manufacturer_id, slug);
+
+-- Add indexes for submission items dependencies
+CREATE INDEX IF NOT EXISTS idx_submission_items_depends_on ON submission_items(depends_on) WHERE depends_on IS NOT NULL;
+CREATE INDEX IF NOT EXISTS idx_submission_items_submission_id ON submission_items(submission_id);
+
+-- Add indexes for date filtering
+CREATE INDEX IF NOT EXISTS idx_parks_status_opening_date ON parks(status, opening_date);
+CREATE INDEX IF NOT EXISTS idx_rides_status_opening_date ON rides(status, opening_date);
+
+-- ============================================================================
+-- VERIFICATION & LOGGING
+-- ============================================================================
+
+-- Log completion
+DO $$
+BEGIN
+  RAISE NOTICE 'Phase 2 DATABASE INTEGRITY ENHANCEMENTS completed successfully';
+  RAISE NOTICE '- Added UNIQUE constraints on slugs (parks, rides, companies, ride_models)';
+  RAISE NOTICE '- Added CHECK constraints for date_precision validation (10+ tables)';
+  RAISE NOTICE '- Added trigger-based validation for submission_items.depends_on';
+  RAISE NOTICE '- Added data integrity constraints (date logic, rating ranges, numeric validation)';
+  RAISE NOTICE '- Added performance indexes for slug lookups and submission dependencies';
+  RAISE NOTICE '- Database integrity now enforced at schema level!';
+END $$;
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