Delete row sig_b4f6c68b3719 from signals

id sig_b4f6c68b3719
event_id evt_9c8e452f40ec
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_f86769431 ...
dedupe_key signal_enriched:news_delta:87e9d5bfd2978684
throttle_s 0
created_at 2026-04-10T18:06:51.938227+00:00
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