Delete row sig_3f5190298f65 from signals

id sig_3f5190298f65
event_id evt_c1ad38520b9e
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_6072ec726 ...
dedupe_key signal_enriched:news_delta:f3de5dd36f3ea908
throttle_s 0
created_at 2026-04-09T19:28:45.824078+00:00
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