Delete row sig_81592abffbed from signals

id sig_81592abffbed
event_id evt_eb4251670705
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_5ffb982e6 ...
dedupe_key signal_enriched:discovery_ipo_delta:b2deca3130f60e ...
throttle_s 0
created_at 2026-04-09T04:42:09.468703+00:00
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