Delete row sig_179c812c2b29 from signals

id sig_179c812c2b29
event_id evt_9fe51f52967e
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_02c7b272d ...
dedupe_key signal_enriched:discovery_ipo_delta:504c09faa508f6 ...
throttle_s 0
created_at 2026-04-22T12:11:11.616908+00:00
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