Delete row sig_4e74c789f401 from signals

id sig_4e74c789f401
event_id evt_63a5c304a6fd
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_808669b6a ...
dedupe_key signal_enriched:news_delta:19deea2b4898c642
throttle_s 0
created_at 2026-04-16T08:54:53.040792+00:00
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