Delete row sig_cd7e40e76361 from signals

id sig_cd7e40e76361
event_id evt_3ee2b89245fa
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_efd83955f ...
dedupe_key signal_enriched:news_delta:70d4e67d2be57db5
throttle_s 0
created_at 2026-04-08T00:26:38.391164+00:00
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