Delete row sig_0275079c4ff6 from signals

id sig_0275079c4ff6
event_id evt_053cb6c80dd2
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_82d69169a ...
dedupe_key signal_enriched:news_delta:dc9b0261dfcf7f70
throttle_s 0
created_at 2026-04-08T09:38:00.974615+00:00
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