Delete row sig_8fd5661afbb6 from signals

id sig_8fd5661afbb6
event_id evt_40073f3b5e6d
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_87951b77e ...
dedupe_key signal_enriched:news_delta:8decf9ea344b2968
throttle_s 0
created_at 2026-04-20T00:47:42.363829+00:00
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