Delete row sig_3f9269ad66f1 from signals

id sig_3f9269ad66f1
event_id evt_db33865444c7
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_8de2b3362 ...
dedupe_key signal_enriched:news_delta:b529406684e37b47
throttle_s 0
created_at 2026-04-19T18:00:50.659165+00:00
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