Delete row sig_009901f6d8a2 from signals

id sig_009901f6d8a2
event_id evt_3fc7fbb30e65
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_b14b97da0 ...
dedupe_key signal_enriched:discovery_ipo_delta:9e7a355a01d0c5 ...
throttle_s 0
created_at 2026-04-20T14:11:25.277652+00:00
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