Delete row sig_3f914b1ceb44 from signals

id sig_3f914b1ceb44
event_id evt_98174f35388f
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_b6a27854a ...
dedupe_key signal_enriched:news_delta:40b98050a4330d2e
throttle_s 0
created_at 2026-04-11T10:31:21.688984+00:00
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