Delete row sig_46ffe6ab2b5c from signals

id sig_46ffe6ab2b5c
event_id evt_b26fb74036ab
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_f947edb3e ...
dedupe_key signal_enriched:news_delta:f625f1a478706aae
throttle_s 0
created_at 2026-04-18T05:14:16.267566+00:00
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