Delete row sig_8ed96ef8f5a9 from signals

id sig_8ed96ef8f5a9
event_id evt_e3a2a76694fa
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_68d1da722 ...
dedupe_key signal_enriched:news_delta:c139502a02d25dd5
throttle_s 0
created_at 2026-04-13T11:10:14.184662+00:00
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