Delete row sig_2bd8b5c2fb01 from signals

id sig_2bd8b5c2fb01
event_id evt_9c51e6056eab
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_8bdf5f979 ...
dedupe_key signal_enriched:news_delta:350389cefd0de164
throttle_s 0
created_at 2026-04-09T22:47:28.522093+00:00
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