Delete row sig_9993adb7012a from signals

id sig_9993adb7012a
event_id evt_542cfec29f52
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_93a9ed68c ...
dedupe_key signal_enriched:news_delta:ce1f9ae32be11771
throttle_s 0
created_at 2026-04-17T13:27:20.843112+00:00
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