Delete row sig_b5b39630e6a3 from signals

id sig_b5b39630e6a3
event_id evt_37e65f7eeb99
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_d60a38f5c ...
dedupe_key signal_enriched:news_delta:7933d2d678b97ab5
throttle_s 0
created_at 2026-04-18T07:00:10.664979+00:00
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