Delete row sig_2845726f834e from signals

id sig_2845726f834e
event_id evt_ef5e719f206b
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_998735081 ...
dedupe_key signal_enriched:news_delta:51525904787274e8
throttle_s 0
created_at 2026-04-06T22:29:23.337919+00:00
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