Delete row sig_3858ddd7762a from signals

id sig_3858ddd7762a
event_id evt_776c8cc24868
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_720ed2482 ...
dedupe_key signal_enriched:news_delta:3f412139f0570962
throttle_s 0
created_at 2026-04-11T17:22:30.915890+00:00
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