Delete row sig_2cfd45f2b22d from signals

id sig_2cfd45f2b22d
event_id evt_74fc388c27fb
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_eebca318e ...
dedupe_key signal_enriched:news_delta:e740aba220633b08
throttle_s 0
created_at 2026-04-20T17:14:49.881375+00:00
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