Delete row sig_17325e57ded2 from signals

id sig_17325e57ded2
event_id evt_148090afca70
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_96dfee983 ...
dedupe_key signal_enriched:news_delta:729aab7983f918c0
throttle_s 0
created_at 2026-04-19T11:09:37.861192+00:00
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