Delete row sig_238637153d5b from signals

id sig_238637153d5b
event_id evt_c62fd811ed23
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_ccce02fd7 ...
dedupe_key signal_enriched:news_delta:3efce59e58133cb1
throttle_s 0
created_at 2026-04-18T08:30:57.233623+00:00
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