Delete row sig_b1e9acda5fd2 from signals

id sig_b1e9acda5fd2
event_id evt_4786b546d226
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_752c230b2 ...
dedupe_key signal_enriched:news_delta:b01565f8f70a4c5a
throttle_s 0
created_at 2026-04-08T02:13:53.642347+00:00
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