Delete row sig_4679f9813cb3 from signals

id sig_4679f9813cb3
event_id evt_a8b1a5488371
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_1c6348e04 ...
dedupe_key signal_enriched:news_delta:563f0abb03dc79b9
throttle_s 0
created_at 2026-04-06T19:27:27.856332+00:00
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