Delete row sig_638f072afd8a from signals

id sig_638f072afd8a
event_id evt_1780f78a99bb
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_341a24268 ...
dedupe_key signal_enriched:news_delta:7bcb97c5112c79e1
throttle_s 0
created_at 2026-04-08T21:48:34.531743+00:00
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