Delete row sig_9af8993fcfd1 from signals

id sig_9af8993fcfd1
event_id evt_00c0a9481756
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_26ec4fb15 ...
dedupe_key signal_enriched:news_delta:bf26a443c28e5b4f
throttle_s 0
created_at 2026-04-13T05:49:28.110841+00:00
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