Delete row sig_8ea49d03fdfb from signals

id sig_8ea49d03fdfb
event_id evt_766afd07bfca
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_04181775e ...
dedupe_key signal_enriched:news_delta:9ccffb46919767c7
throttle_s 0
created_at 2026-04-10T18:45:20.608587+00:00
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