Delete row sig_a8117a11498d from signals

id sig_a8117a11498d
event_id evt_a176c5e20206
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_85fa5c3e5 ...
dedupe_key signal_enriched:news_delta:0ca959c41600b57a
throttle_s 0
created_at 2026-04-20T13:02:54.594570+00:00
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