Delete row sig_38b54b3bf566 from signals

id sig_38b54b3bf566
event_id evt_ac5ca0b64674
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_80b1e0f44 ...
dedupe_key signal_enriched:news_delta:d2247d35b68d60a9
throttle_s 0
created_at 2026-04-17T09:00:15.464415+00:00
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