Delete row sig_7397fb45116b from signals

id sig_7397fb45116b
event_id evt_ab5a137743fc
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_00804a44e ...
dedupe_key signal_enriched:news_delta:a016047e24c700d6
throttle_s 0
created_at 2026-04-13T13:18:39.887755+00:00
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