-- Add unique constraint to celestial_events table to prevent duplicate events
-- This ensures that the same event (same body, type, and time) cannot be inserted twice

-- Step 1: Remove duplicate events (keep the earliest created_at)
WITH duplicates AS (
    SELECT
        id,
        ROW_NUMBER() OVER (
            PARTITION BY body_id, event_type, DATE_TRUNC('minute', event_time)
            ORDER BY created_at ASC
        ) AS rn
    FROM celestial_events
)
DELETE FROM celestial_events
WHERE id IN (
    SELECT id FROM duplicates WHERE rn > 1
);

-- Step 2: Add unique constraint
-- Note: We truncate to minute precision for event_time to handle slight variations
-- Create a unique index instead of constraint to allow custom handling
CREATE UNIQUE INDEX IF NOT EXISTS idx_celestial_events_unique
ON celestial_events (
    body_id,
    event_type,
    DATE_TRUNC('minute', event_time)
);

-- Note: For the exact timestamp constraint, use this instead:
-- CREATE UNIQUE INDEX IF NOT EXISTS idx_celestial_events_unique_exact
-- ON celestial_events (body_id, event_type, event_time);

-- Verify the constraint was added
SELECT
    indexname,
    indexdef
FROM pg_indexes
WHERE tablename = 'celestial_events' AND indexname = 'idx_celestial_events_unique';

-- Check for remaining duplicates
SELECT
    body_id,
    event_type,
    DATE_TRUNC('minute', event_time) as event_time_minute,
    COUNT(*) as count
FROM celestial_events
GROUP BY body_id, event_type, DATE_TRUNC('minute', event_time)
HAVING COUNT(*) > 1;