Delete row sig_8e8bec93dbec from signals

id sig_8e8bec93dbec
event_id evt_eeaf067196ea
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_326d5af63 ...
dedupe_key signal_enriched:news_delta:33694e239b3979e2
throttle_s 0
created_at 2026-04-20T12:47:45.066846+00:00
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