Delete row sig_c9979f9a5422 from signals

id sig_c9979f9a5422
event_id evt_4477a9cee8d9
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_c66720ae7 ...
dedupe_key signal_enriched:discovery_ipo_delta:f7a10f9ca4f4a6 ...
throttle_s 0
created_at 2026-04-22T04:05:03.223061+00:00
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