Delete row sig_de5880e9e8e1 from signals

id sig_de5880e9e8e1
event_id evt_37c597403e0d
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_4d634ef24 ...
dedupe_key signal_enriched:discovery_ipo_delta:46ee7c557c498a ...
throttle_s 0
created_at 2026-04-10T13:12:08.706840+00:00
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