Delete row sig_46ffb98df7df from signals

id sig_46ffb98df7df
event_id evt_f9417e84f45c
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_e5f7b19bb ...
dedupe_key signal_enriched:news_delta:cef301903166e736
throttle_s 0
created_at 2026-04-08T05:04:20.865685+00:00
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