Delete row sig_275083e394cb from signals

id sig_275083e394cb
event_id evt_21c6877ffa22
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_da5e305a4 ...
dedupe_key signal_enriched:news_delta:c1d2b60ecc0e10b5
throttle_s 0
created_at 2026-04-20T07:58:10.444566+00:00
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