Delete row sig_9cc189e892fa from signals

id sig_9cc189e892fa
event_id evt_6901790e6ff4
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_8a2c53577 ...
dedupe_key signal_enriched:discovery_ipo_delta:9755c3b416a7bd ...
throttle_s 0
created_at 2026-04-22T10:08:37.182699+00:00
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