Delete row sig_0d3f948b6011 from signals

id sig_0d3f948b6011
event_id evt_bf9aa204c415
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_4d06887b0 ...
dedupe_key signal_enriched:news_delta:047f3607f9d6830b
throttle_s 0
created_at 2026-04-11T15:52:30.152653+00:00
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