-- Triggers and event triggers
-- Generated: 2025-10-15T12:24:56.582392

-- Event triggers
-- Event trigger: prevent_series_drops
CREATE OR REPLACE FUNCTION meta.prevent_direct_drop()
 RETURNS event_trigger
 LANGUAGE plpgsql
AS $function$
DECLARE
    obj record;
BEGIN
    -- Get the current context
    IF current_setting('application.dropping_series', true) = 'true' THEN
        -- Allow the drop if it's coming from our procedures
        RETURN;
    END IF;

    FOR obj IN SELECT * FROM pg_event_trigger_dropped_objects()
    WHERE object_type = 'table'
    LOOP
        IF EXISTS (
            SELECT 1 FROM meta.series
            WHERE table_name = obj.object_name
            AND db_schema = obj.schema_name
        ) THEN
            RAISE EXCEPTION 'Table %.% is registered in series and can only be dropped using TimeseriesDB.drop_series()',
                obj.schema_name, obj.object_name;
        END IF;
    END LOOP;
END;
$function$;


CREATE EVENT TRIGGER prevent_series_drops
  ON sql_drop
  EXECUTE FUNCTION meta.prevent_direct_drop();