Delete row sig_ad3cafc3bef2 from signals

id sig_ad3cafc3bef2
event_id evt_51d80f957b8a
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_da0df14c1 ...
dedupe_key signal_enriched:news_delta:fd0859aaff3d6613
throttle_s 0
created_at 2026-04-18T15:11:39.947193+00:00
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