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-- The common-pattern enrichment worker fills descriptions on
-- common_tracker_patterns using an agent with web search, then fans the
-- result out to every linked tracker pattern. enrichment_requested_at is
-- the work queue (claimed FOR UPDATE SKIP LOCKED); enriched_at marks a
-- row as terminally enriched so it is never re-enqueued.
ALTER TABLE common_tracker_patterns
    ADD COLUMN enrichment_requested_at TIMESTAMP WITH TIME ZONE,
    ADD COLUMN enriched_at             TIMESTAMP WITH TIME ZONE;

CREATE INDEX idx_common_tracker_patterns_enrichment
    ON common_tracker_patterns (enrichment_requested_at)
    WHERE enrichment_requested_at IS NOT NULL;

-- Enqueue existing description-less rows for a first enrichment pass.
UPDATE common_tracker_patterns
SET enrichment_requested_at = NOW()
WHERE description = '';