Delete row sig_18e8e9a43296 from signals

id sig_18e8e9a43296
event_id evt_7c52c7027717
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_94cfe1dd6 ...
dedupe_key signal_enriched:news_delta:4d3317718cf0c44c
throttle_s 0
created_at 2026-04-10T05:02:39.568980+00:00
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