Delete row sig_9c154e65259e from signals

id sig_9c154e65259e
event_id evt_3581a6a196b9
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_72108033e ...
dedupe_key signal_enriched:news_delta:de73259e58e2261b
throttle_s 0
created_at 2026-04-07T02:56:08.017008+00:00
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