Delete row sig_2fcdf9f75a6d from signals

id sig_2fcdf9f75a6d
event_id evt_810756ed4de4
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_236fc8211 ...
dedupe_key signal_enriched:news_delta:37647ef88573d26b
throttle_s 0
created_at 2026-04-12T07:50:13.696027+00:00
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