Delete row sig_8accfc4ba186 from signals

id sig_8accfc4ba186
event_id evt_5e51282394ca
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_342c7134d ...
dedupe_key signal_enriched:news_delta:7700cdda472c2143
throttle_s 0
created_at 2026-04-10T18:06:51.548375+00:00
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