Delete row sig_c9cf89de2f50 from signals

id sig_c9cf89de2f50
event_id evt_3ce8881989c1
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_2ef7318d4 ...
dedupe_key signal_enriched:discovery_ipo_delta:188761c0a0b3b3 ...
throttle_s 0
created_at 2026-04-08T05:30:32.359517+00:00
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