Delete row sig_9e39206942a9 from signals

id sig_9e39206942a9
event_id evt_8a2b8c0fa473
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_13d5a8b39 ...
dedupe_key signal_enriched:news_delta:f048486cd163f148
throttle_s 0
created_at 2026-04-18T05:29:26.908923+00:00
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