Delete row sig_0fdd55451876 from signals

id sig_0fdd55451876
event_id evt_6ec2ac0a3b25
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_5de632ea0 ...
dedupe_key signal_enriched:news_delta:514c643b09d4b008
throttle_s 0
created_at 2026-04-20T14:20:31.005476+00:00
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