Delete row sig_dc219a7db842 from signals

id sig_dc219a7db842
event_id evt_04d46e98be1d
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_dd6f3dde8 ...
dedupe_key signal_enriched:news_delta:4070dec9c427c18b
throttle_s 0
created_at 2026-04-10T04:47:24.585896+00:00
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