Delete row sig_cb5e47bd08cf from signals

id sig_cb5e47bd08cf
event_id evt_62c668ea53ce
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_d72389c6a ...
dedupe_key signal_enriched:news_delta:04162cdd468c5f72
throttle_s 0
created_at 2026-04-10T17:15:05.619769+00:00
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