Delete row sig_9cfa7fff82ad from signals

id sig_9cfa7fff82ad
event_id evt_7db1bf268154
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_c90850846 ...
dedupe_key signal_enriched:news_delta:19253706a2f19543
throttle_s 0
created_at 2026-04-09T13:30:32.944952+00:00
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