Delete row sig_08cfb8cf0690 from signals

id sig_08cfb8cf0690
event_id evt_ba8f4da0f738
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_a9cbf05f0 ...
dedupe_key signal_enriched:news_delta:03b70f7035c3db57
throttle_s 0
created_at 2026-04-08T04:33:58.949501+00:00
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