Delete row sig_4b824ea600f4 from signals

id sig_4b824ea600f4
event_id evt_dffae44641bb
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_584c61f84 ...
dedupe_key signal_enriched:discovery_ipo_delta:1820aa29645064 ...
throttle_s 0
created_at 2026-04-09T22:59:43.472613+00:00
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