Delete row sig_3cd159cd7793 from signals

id sig_3cd159cd7793
event_id evt_9f696f6df176
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_26e583341 ...
dedupe_key signal_enriched:news_delta:09669003fab3a0aa
throttle_s 0
created_at 2026-04-19T21:38:50.651619+00:00
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