Delete row sig_bf3724976a3a from signals

id sig_bf3724976a3a
event_id evt_983d6d7a1517
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_df865c4b9 ...
dedupe_key signal_enriched:news_delta:3ca942fb1dedcc3c
throttle_s 0
created_at 2026-04-08T09:38:01.011171+00:00
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