Delete row sig_cfe86e780fac from signals

id sig_cfe86e780fac
event_id evt_7eb6ef697355
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_4cd67a0bb ...
dedupe_key signal_enriched:news_delta:185bcaf4e563e5a9
throttle_s 0
created_at 2026-04-20T10:15:21.982268+00:00
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