Delete row sig_14afef15266c from signals

id sig_14afef15266c
event_id evt_e9962cec0520
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_66c9731cc ...
dedupe_key signal_enriched:discovery_ipo_delta:2dcda70f9f17b1 ...
throttle_s 0
created_at 2026-04-19T02:17:29.223764+00:00
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