Delete row sig_5cfc56c9b06c from signals

id sig_5cfc56c9b06c
event_id evt_cd7acc9117ab
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_5043b4bb7 ...
dedupe_key signal_enriched:news_delta:1c438b124ea630d1
throttle_s 0
created_at 2026-04-17T02:58:03.999489+00:00
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