Delete row sig_ab1382ba7864 from signals

id sig_ab1382ba7864
event_id evt_f474caba89eb
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_2fdbf877f ...
dedupe_key signal_enriched:news_delta:07ff992345b6f2fb
throttle_s 0
created_at 2026-04-16T12:11:46.098626+00:00
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