Delete row sig_4ff7957ba8bd from signals

id sig_4ff7957ba8bd
event_id evt_20ef2bcf2ce8
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_108d0d971 ...
dedupe_key signal_enriched:news_delta:f11ea9faea8ddb74
throttle_s 0
created_at 2026-04-15T21:55:46.388734+00:00
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