Delete row sig_cd9bd54fd338 from signals

id sig_cd9bd54fd338
event_id evt_399fb5fafc51
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_ec6b382f1 ...
dedupe_key signal_enriched:news_delta:5ee9de2777382cf3
throttle_s 0
created_at 2026-04-07T02:56:07.979203+00:00
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