-- Migration 091: Sag contacts primary flag

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'sag_kontakter' AND column_name = 'is_primary'
    ) THEN
        ALTER TABLE sag_kontakter ADD COLUMN is_primary BOOLEAN DEFAULT FALSE;
    END IF;
END $$;

-- Ensure only one primary contact per case
CREATE UNIQUE INDEX IF NOT EXISTS idx_sag_kontakter_primary
    ON sag_kontakter (sag_id)
    WHERE is_primary = TRUE;