Delete row sig_2738aba9a8c2 from signals

id sig_2738aba9a8c2
event_id evt_0165ab9889ad
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_836f1f3f1 ...
dedupe_key signal_enriched:news_delta:ac5ed3e962fcde57
throttle_s 0
created_at 2026-04-06T13:34:01.238229+00:00
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