Delete row sig_4523262f9c79 from signals

id sig_4523262f9c79
event_id evt_9eea898ba2f3
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_309425660 ...
dedupe_key signal_enriched:news_delta:11eaef48c20c0e99
throttle_s 0
created_at 2026-04-20T02:49:52.645157+00:00
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