Delete row sig_d9a492bb1f1d from signals

id sig_d9a492bb1f1d
event_id evt_a6f901991dc0
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_3e314f1f0 ...
dedupe_key signal_enriched:news_delta:fc857e21002df5ad
throttle_s 0
created_at 2026-04-06T17:58:09.503271+00:00
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