Delete row sig_8d518ee66d6f from signals

id sig_8d518ee66d6f
event_id evt_4f6ae2a2db3f
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_08f819b43 ...
dedupe_key signal_enriched:news_delta:e7e3d193b23f355f
throttle_s 0
created_at 2026-04-13T12:39:41.691743+00:00
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