Delete row sig_8b8e6eeaf677 from signals

id sig_8b8e6eeaf677
event_id evt_3db160622619
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_d2fe8dc66 ...
dedupe_key signal_enriched:news_delta:cbe7146389efd1f1
throttle_s 0
created_at 2026-04-20T10:30:31.842773+00:00
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