Delete row sig_b527ccf6f908 from signals

id sig_b527ccf6f908
event_id evt_3336c01af31d
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_2718a910c ...
dedupe_key signal_enriched:news_delta:a44a842fe074eb02
throttle_s 0
created_at 2026-04-16T08:24:33.919505+00:00
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