Delete row sig_8c12f9a882b3 from signals

id sig_8c12f9a882b3
event_id evt_fa44e4d01a16
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_2d9f47f05 ...
dedupe_key signal_enriched:news_delta:27aab34f2697ba0d
throttle_s 0
created_at 2026-04-19T00:02:36.093613+00:00
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