Delete row sig_5c588e82c868 from signals

id sig_5c588e82c868
event_id evt_aa13784a751b
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_de75b868b ...
dedupe_key signal_enriched:news_delta:022deec9bbd1fc46
throttle_s 0
created_at 2026-04-08T07:51:57.549128+00:00
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