Delete row sig_b10fcceb195b from signals

id sig_b10fcceb195b
event_id evt_01d76b7e5f59
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_bcf37db9a ...
dedupe_key signal_enriched:news_delta:279640011bdbd3d3
throttle_s 0
created_at 2026-04-08T05:19:26.468040+00:00
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