Delete row sig_4f8cd8889f2d from signals

id sig_4f8cd8889f2d
event_id evt_adfac190583a
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_76c70bd0a ...
dedupe_key signal_enriched:news_delta:5942f35d3bcc1c0c
throttle_s 0
created_at 2026-04-15T06:03:50.451391+00:00
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