Delete row sig_478399ad79e8 from signals

id sig_478399ad79e8
event_id evt_0baa53e7e9ef
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_27bda8fa6 ...
dedupe_key signal_enriched:news_delta:38fdbc0d21adeccc
throttle_s 0
created_at 2026-04-22T11:31:53.855298+00:00
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