Delete row sig_d381bd0fd950 from signals

id sig_d381bd0fd950
event_id evt_2634b006a931
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_dc500c784 ...
dedupe_key signal_enriched:news_delta:c4cfc0d23fa8f24e
throttle_s 0
created_at 2026-04-17T22:47:58.879839+00:00
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