Delete row sig_8e7af8608902 from signals

id sig_8e7af8608902
event_id evt_38d4f15611d0
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_d5e1a8b02 ...
dedupe_key signal_enriched:news_delta:10daa45b29902fee
throttle_s 0
created_at 2026-04-17T19:38:48.150093+00:00
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