Delete row sig_f3728145f5cd from signals

id sig_f3728145f5cd
event_id evt_5dba075c91f1
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_f305eca8d ...
dedupe_key signal_enriched:news_delta:57723b8ac30d193b
throttle_s 0
created_at 2026-04-09T12:52:05.900812+00:00
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