Delete row sig_9397e7918151 from signals

id sig_9397e7918151
event_id evt_fde02c268bb8
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_af87f8537 ...
dedupe_key signal_enriched:news_delta:ce72f500abad85fb
throttle_s 0
created_at 2026-04-12T20:02:49.945467+00:00
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