Delete row sig_517d9a2339f4 from signals

id sig_517d9a2339f4
event_id evt_1679aec19c9e
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_d8683011a ...
dedupe_key signal_enriched:discovery_ipo_delta:52fa212fc5425f ...
throttle_s 0
created_at 2026-04-17T23:00:32.547123+00:00
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