Delete row sig_8a266c119b02 from signals

id sig_8a266c119b02
event_id evt_0f6e1fcfa0f9
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_56c368c58 ...
dedupe_key signal_enriched:news_delta:16547d3dcee3d083
throttle_s 0
created_at 2026-04-07T05:08:56.213547+00:00
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