Delete row sig_254b14bf3f04 from signals

id sig_254b14bf3f04
event_id evt_b7c300ce1f85
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_013ac2aba ...
dedupe_key signal_enriched:news_delta:36eb08c17484ab03
throttle_s 0
created_at 2026-04-10T13:23:11.056742+00:00
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