Delete row sig_4a3de50ae792 from signals

id sig_4a3de50ae792
event_id evt_31787aff9e9e
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_e8f360707 ...
dedupe_key signal_enriched:news_delta:45564e9bf1a21221
throttle_s 0
created_at 2026-04-09T05:26:02.304472+00:00
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