Delete row sig_d8302cc1d2ac from signals

id sig_d8302cc1d2ac
event_id evt_b429237ce398
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_3fc5a790f ...
dedupe_key signal_enriched:discovery_ipo_delta:ab777944c52c56 ...
throttle_s 0
created_at 2026-04-20T18:44:57.233742+00:00
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