Delete row sig_f9575b3b745f from signals

id sig_f9575b3b745f
event_id evt_3fca5b6076b0
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_9aa73827b ...
dedupe_key signal_enriched:news_delta:48b9ca39e9f2f613
throttle_s 0
created_at 2026-04-10T03:30:53.161018+00:00
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