Delete row sig_679c370441aa from signals

id sig_679c370441aa
event_id evt_05244332409d
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_0ba1d18eb ...
dedupe_key signal_enriched:news_delta:66b7f77ba842ffbe
throttle_s 0
created_at 2026-04-10T13:38:20.384983+00:00
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