Delete row sig_35520ef1fac8 from signals

id sig_35520ef1fac8
event_id evt_43ad011ee152
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_facd4e9a4 ...
dedupe_key signal_enriched:news_delta:bbca18723b14c965
throttle_s 0
created_at 2026-04-06T17:07:34.418685+00:00
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