Delete row sig_b89c4861d1f3 from signals

id sig_b89c4861d1f3
event_id evt_957ac9fad775
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_4628e1049 ...
dedupe_key signal_enriched:news_delta:e13ade48b90ff949
throttle_s 0
created_at 2026-04-10T04:47:25.151559+00:00
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