Delete row sig_654c31bd79c0 from signals

id sig_654c31bd79c0
event_id evt_97f64aa3a43e
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_5074029c6 ...
dedupe_key signal_enriched:discovery_ipo_delta:ac8b0577777dd3 ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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