Delete row sig_47877ba7d4b5 from signals

id sig_47877ba7d4b5
event_id evt_5b6c00c356bd
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_cf67dd44a ...
dedupe_key signal_enriched:news_delta:78d832503cff59a6
throttle_s 0
created_at 2026-04-10T02:44:17.237680+00:00
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