Delete row sig_97020f278ed4 from signals

id sig_97020f278ed4
event_id evt_25554582a8da
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_99851d30a ...
dedupe_key signal_enriched:discovery_ipo_delta:e891152871f778 ...
throttle_s 0
created_at 2026-04-08T06:31:07.641041+00:00
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