Delete row sig_573749898234 from signals

id sig_573749898234
event_id evt_dafc6e1ce021
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_58ade9724 ...
dedupe_key signal_enriched:news_delta:7d5a27613db646cd
throttle_s 0
created_at 2026-04-20T17:59:51.977997+00:00
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