Delete row sig_466c0c2cf6e6 from signals

id sig_466c0c2cf6e6
event_id evt_c8bfff1e35f6
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_ee9451a25 ...
dedupe_key signal_enriched:news_delta:1c8aabcba082f1ad
throttle_s 0
created_at 2026-04-09T19:28:45.931231+00:00
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