Delete row sig_4866f9ff1b18 from signals

id sig_4866f9ff1b18
event_id evt_1de4047a9bf9
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_4c931869e ...
dedupe_key signal_enriched:news_delta:313fcafbb4bdeded
throttle_s 0
created_at 2026-04-08T06:36:01.129579+00:00
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