Delete row sig_d918ac9c31ca from signals

id sig_d918ac9c31ca
event_id evt_b7b816cee8df
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_337944b23 ...
dedupe_key signal_enriched:discovery_ipo_delta:62d0f7d12678e5 ...
throttle_s 0
created_at 2026-04-20T20:32:04.855080+00:00
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