Delete row sig_481dd2564887 from signals

id sig_481dd2564887
event_id evt_f5efcdc0fc12
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_456e6e305 ...
dedupe_key signal_enriched:news_delta:bff3149279efbbbf
throttle_s 0
created_at 2026-04-07T23:54:56.132587+00:00
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