Delete row sig_0ef1046cadd6 from signals

id sig_0ef1046cadd6
event_id evt_8a8d1ab8d133
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_43a006da4 ...
dedupe_key signal_enriched:news_delta:a6f7482b7992d70f
throttle_s 0
created_at 2026-04-19T19:30:21.211416+00:00
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