Delete row sig_2fd7cc34255e from signals

id sig_2fd7cc34255e
event_id evt_564ed2ecb7dd
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_9dc2337b3 ...
dedupe_key signal_enriched:news_delta:c5412ff1f4ff8906
throttle_s 0
created_at 2026-04-21T02:24:00.063819+00:00
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