Delete row sig_6ac66ae9ca5e from signals

id sig_6ac66ae9ca5e
event_id evt_c610854d093b
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_e338d8585 ...
dedupe_key signal_enriched:news_delta:0255be36333fe006
throttle_s 0
created_at 2026-04-10T17:15:06.229197+00:00
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