Delete row sig_ad2545a7dfda from signals

id sig_ad2545a7dfda
event_id evt_e152d759dd89
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_740ec07db ...
dedupe_key signal_enriched:news_delta:9696ef49893dbe03
throttle_s 0
created_at 2026-04-09T09:54:21.076666+00:00
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