Delete row sig_8e9fdf747ade from signals

id sig_8e9fdf747ade
event_id evt_0d639f2f0c31
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_287b75b23 ...
dedupe_key signal_enriched:news_delta:2735e09ea35709fb
throttle_s 0
created_at 2026-04-08T05:04:20.326967+00:00
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