Delete row sig_8f70b5260711 from signals

id sig_8f70b5260711
event_id evt_ba744d53fa05
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_27eb6c931 ...
dedupe_key signal_enriched:news_delta:d3bab5a94d9a4245
throttle_s 0
created_at 2026-04-13T07:19:17.720800+00:00
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