Delete row sig_f9452d2601f4 from signals

id sig_f9452d2601f4
event_id evt_8c409a4a5554
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_56a6903f5 ...
dedupe_key signal_enriched:news_delta:bd5622abe58947ae
throttle_s 0
created_at 2026-04-12T03:31:55.419238+00:00
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