Delete row sig_d37092517354 from signals

id sig_d37092517354
event_id evt_139a9dd492ff
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_7c659cb70 ...
dedupe_key signal_enriched:news_delta:8df2b57760fbda71
throttle_s 0
created_at 2026-04-08T19:34:52.436607+00:00
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