Delete row sig_2fcce1af9177 from signals

id sig_2fcce1af9177
event_id evt_ba39f5eef1a6
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_57ec4f427 ...
dedupe_key signal_enriched:news_delta:453b21b46c13550f
throttle_s 0
created_at 2026-04-19T09:39:51.337719+00:00
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