Delete row sig_38483a62c60d from signals

id sig_38483a62c60d
event_id evt_9fb77bd70260
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_9ccb6ca52 ...
dedupe_key signal_enriched:news_delta:8204b6ee5d8d13a8
throttle_s 0
created_at 2026-04-10T08:04:23.176682+00:00
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