Delete row sig_500e8cb39e6c from signals

id sig_500e8cb39e6c
event_id evt_eea9b2d68a27
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_062819f3a ...
dedupe_key signal_enriched:news_delta:b7c829107d8c4895
throttle_s 0
created_at 2026-04-15T10:32:45.632538+00:00
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