Delete row sig_5bc3ea111284 from signals

id sig_5bc3ea111284
event_id evt_b39ea5092988
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_fba252371 ...
dedupe_key signal_enriched:discovery_ipo_delta:95d02bdd333aec ...
throttle_s 0
created_at 2026-04-22T05:05:37.070925+00:00
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