Delete row sig_5d831b3bf749 from signals

id sig_5d831b3bf749
event_id evt_33708c81bad3
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_46d666730 ...
dedupe_key signal_enriched:news_delta:0d6de5825a14ec24
throttle_s 0
created_at 2026-04-19T04:31:32.851802+00:00
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