Delete row sig_a469cf27de29 from signals

id sig_a469cf27de29
event_id evt_d7bb467800bb
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_9746ecfd2 ...
dedupe_key signal_enriched:news_delta:e7f072340eaafacc
throttle_s 0
created_at 2026-04-20T15:19:30.625150+00:00
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