Delete row sig_a406a4a6e53b from signals

id sig_a406a4a6e53b
event_id evt_db33a423c61f
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_547f30a8e ...
dedupe_key signal_enriched:news_delta:04e28f2d58944416
throttle_s 0
created_at 2026-04-22T11:47:01.124672+00:00
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