Delete row sig_8ee2ab70c680 from signals

id sig_8ee2ab70c680
event_id evt_cfd6f3f978fe
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_fbc8a05dc ...
dedupe_key signal_enriched:news_delta:7662f20f5d3bd538
throttle_s 0
created_at 2026-04-17T19:38:48.008423+00:00
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