Delete row sig_f3e6a9fed793 from signals

id sig_f3e6a9fed793
event_id evt_f6d55bb1a08e
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_dd91f15ee ...
dedupe_key signal_enriched:news_delta:8e1ec5763af85345
throttle_s 0
created_at 2026-04-17T11:07:22.011708+00:00
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