Delete row sig_2cd5db64c96c from signals

id sig_2cd5db64c96c
event_id evt_3d625c1859f8
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_d6389400f ...
dedupe_key signal_enriched:news_delta:4991240b2ca7dcd5
throttle_s 0
created_at 2026-04-19T22:46:35.447231+00:00
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