Delete row sig_bf9c46b98685 from signals

id sig_bf9c46b98685
event_id evt_c11bb2f071b0
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_a25e10e64 ...
dedupe_key signal_enriched:news_delta:a5e58859065c0d0d
throttle_s 0
created_at 2026-04-13T19:00:27.237940+00:00
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