Delete row sig_66eda9c5fa27 from signals

id sig_66eda9c5fa27
event_id evt_688a3d983141
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_1a79a8003 ...
dedupe_key signal_enriched:news_delta:f0a9fa953f32a944
throttle_s 0
created_at 2026-04-18T13:34:52.847132+00:00
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