Delete row sig_9d5e6dc89cd5 from signals

id sig_9d5e6dc89cd5
event_id evt_fbccf2e19ecb
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_4b83253eb ...
dedupe_key signal_enriched:discovery_ipo_delta:e54a3a95027612 ...
throttle_s 0
created_at 2026-04-09T12:08:05.625638+00:00
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