Delete row sig_9f486f93932d from signals

id sig_9f486f93932d
event_id evt_83313be886f0
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_e78f92e2a ...
dedupe_key signal_enriched:news_delta:b898b8b26a4dad17
throttle_s 0
created_at 2026-04-08T06:36:01.107277+00:00
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