Delete row sig_3787aafca1d1 from signals

id sig_3787aafca1d1
event_id evt_9dc8815165a4
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_98942f86a ...
dedupe_key signal_enriched:news_delta:46e9c7795a052e08
throttle_s 0
created_at 2026-04-22T13:48:26.936894+00:00
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