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-- Example: Recent high-value events across catalogs
SELECT
    event_name,
    user_id,
    event_timestamp,
    CAST(event_properties AS JSON) as event_properties
FROM catalog.schema.user_events
WHERE event_timestamp >= current_timestamp - INTERVAL '7' DAY
    AND JSON_EXTRACT_SCALAR(event_properties, '$.value') > '100'
ORDER BY event_timestamp DESC;

-- Example: Federated query across multiple data sources
SELECT
    'combined_activity' as event_name,
    u.user_id,
    current_timestamp as event_timestamp,
    JSON_FORMAT(JSON_OBJECT(
        'web_sessions', w.session_count,
        'mobile_events', m.event_count,
        'purchase_value', p.total_value
    )) as event_properties
FROM postgres_catalog.users.profiles u
LEFT JOIN web_catalog.analytics.sessions w ON u.user_id = w.user_id
LEFT JOIN mobile_catalog.events.activities m ON u.user_id = m.user_id
LEFT JOIN purchases_catalog.orders.summary p ON u.user_id = p.user_id
WHERE u.created_date >= current_date - INTERVAL '30' DAY;