Delete row sig_ad7db9495fcd from signals

id sig_ad7db9495fcd
event_id evt_92fa8f832191
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_fa37a48b5 ...
dedupe_key signal_enriched:news_delta:a7b431351e5726ec
throttle_s 0
created_at 2026-04-09T17:20:47.407291+00:00
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