Delete row sig_47f37175c39a from signals

id sig_47f37175c39a
event_id evt_3b90f7985c95
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_76703d37a ...
dedupe_key signal_enriched:news_delta:2c06d2d079ed97a5
throttle_s 0
created_at 2026-04-10T08:19:32.479759+00:00
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