Delete row sig_8ef1a5252472 from signals

id sig_8ef1a5252472
event_id evt_df07a1a86c6c
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_607dbb19c ...
dedupe_key signal_enriched:news_delta:67cb7282782203c9
throttle_s 0
created_at 2026-04-19T02:09:54.731831+00:00
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