Delete row sig_4fb46fb4cce8 from signals

id sig_4fb46fb4cce8
event_id evt_13987b43bacf
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_e1bc1d087 ...
dedupe_key signal_enriched:news_delta:e58bd1c0eb8db3ee
throttle_s 0
created_at 2026-04-18T20:11:34.038637+00:00
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