Delete row sig_64652e5ee11a from signals

id sig_64652e5ee11a
event_id evt_f15e34bebe2b
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_139a68e41 ...
dedupe_key signal_enriched:news_delta:7a663978a4210715
throttle_s 0
created_at 2026-04-18T02:26:43.653794+00:00
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