Delete row sig_ca3a31159230 from signals

id sig_ca3a31159230
event_id evt_ba46fc253b16
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_6315bcd14 ...
dedupe_key signal_enriched:discovery_ipo_delta:a022b2afcc0940 ...
throttle_s 0
created_at 2026-04-21T12:20:48.730501+00:00
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