Delete row sig_18e1f4b21aba from signals

id sig_18e1f4b21aba
event_id evt_1315cb6599e9
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_dd8546ef6 ...
dedupe_key signal_enriched:news_delta:a3f342613690e5c6
throttle_s 0
created_at 2026-04-09T09:54:21.946013+00:00
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