Delete row sig_6c5b88c15031 from signals

id sig_6c5b88c15031
event_id evt_518db40a4374
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_1fc376535 ...
dedupe_key signal_enriched:discovery_ipo_delta:80e8b072e45255 ...
throttle_s 0
created_at 2026-04-11T15:08:00.060011+00:00
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