Delete row sig_cbf1d3a888bd from signals

id sig_cbf1d3a888bd
event_id evt_97758334b893
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_04f256a39 ...
dedupe_key signal_enriched:news_delta:85c34e469aaa7136
throttle_s 0
created_at 2026-04-21T04:05:36.911610+00:00
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