Delete row sig_38ff821a5621 from signals

id sig_38ff821a5621
event_id evt_13c4af42abd1
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_03ea5af4b ...
dedupe_key signal_enriched:news_delta:eb14a053b2bbcb6c
throttle_s 0
created_at 2026-04-22T07:27:53.152485+00:00
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