Delete row sig_bdb9589b5dd1 from signals

id sig_bdb9589b5dd1
event_id evt_2b9927c79e98
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_5a1e1541a ...
dedupe_key signal_enriched:news_delta:075f13dfc72d22b8
throttle_s 0
created_at 2026-04-13T11:48:55.367022+00:00
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