Delete row sig_9eaac68b1ed6 from signals

id sig_9eaac68b1ed6
event_id evt_f9903fab6a06
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_38750225f ...
dedupe_key signal_enriched:news_delta:f49e66991666ee24
throttle_s 0
created_at 2026-04-09T15:01:33.652668+00:00
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