Delete row sig_9f37ef662298 from signals

id sig_9f37ef662298
event_id evt_f19afe5f54bb
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_ce063f295 ...
dedupe_key signal_enriched:news_delta:04ce3bcdcfba0f60
throttle_s 0
created_at 2026-04-12T03:16:46.874996+00:00
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