Delete row sig_4986d92a6cd6 from signals

id sig_4986d92a6cd6
event_id evt_1760c04c9175
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_1d282013f ...
dedupe_key signal_enriched:news_delta:895af798c80e7f9b
throttle_s 0
created_at 2026-04-20T09:59:20.241330+00:00
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