Delete row sig_0989ff0a1976 from signals

id sig_0989ff0a1976
event_id evt_31d21ebbc330
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_e2d4f7220 ...
dedupe_key signal_enriched:discovery_ipo_delta:fbdc6613930a86 ...
throttle_s 0
created_at 2026-04-17T21:52:12.771882+00:00
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