Delete row sig_5b8f3e3f5cac from signals

id sig_5b8f3e3f5cac
event_id evt_65537216dce1
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_fd2e05b7c ...
dedupe_key signal_enriched:news_delta:fa3023fd734dae76
throttle_s 0
created_at 2026-04-18T10:17:55.984871+00:00
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