Delete row sig_f5ca83a76d8d from signals

id sig_f5ca83a76d8d
event_id evt_be12d6ead0da
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_174187ca1 ...
dedupe_key signal_enriched:news_delta:3e06ebf919841f95
throttle_s 0
created_at 2026-04-19T23:16:51.067545+00:00
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