Delete row sig_b2efdc408a46 from signals

id sig_b2efdc408a46
event_id evt_40db88c4f701
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_3f149f7fa ...
dedupe_key signal_enriched:news_delta:6ed3f5cc49ee98ba
throttle_s 0
created_at 2026-04-10T17:15:05.608697+00:00
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