Delete row sig_1792033b850d from signals

id sig_1792033b850d
event_id evt_0d7c6c3f934e
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_31875e73e ...
dedupe_key signal_enriched:news_delta:4bd58bb5c82a4a43
throttle_s 0
created_at 2026-04-08T11:24:56.586519+00:00
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