Delete row sig_cd03e9f4f55c from signals

id sig_cd03e9f4f55c
event_id evt_f48662533273
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_9f361fd35 ...
dedupe_key signal_enriched:news_delta:04632ee84bd7639e
throttle_s 0
created_at 2026-04-20T11:15:52.211776+00:00
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