Delete row sig_59f9de148820 from signals

id sig_59f9de148820
event_id evt_dfc15ab91614
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_5d50b2e27 ...
dedupe_key signal_enriched:news_delta:9de1101be0efe103
throttle_s 0
created_at 2026-04-09T21:31:27.031870+00:00
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