Delete row sig_12712ed7a9cb from signals

id sig_12712ed7a9cb
event_id evt_5b9411b688a9
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_268ee0549 ...
dedupe_key signal_enriched:news_delta:8bd59603b07663a7
throttle_s 0
created_at 2026-04-19T05:09:15.322810+00:00
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