Delete row sig_eff8b8d9f6af from signals

id sig_eff8b8d9f6af
event_id evt_8475397e2df9
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_4429ee7ba ...
dedupe_key signal_enriched:news_delta:b1aca12431312550
throttle_s 0
created_at 2026-04-20T09:13:47.457522+00:00
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