Delete row sig_4b4d5f9d26f0 from signals

id sig_4b4d5f9d26f0
event_id evt_48592c97797f
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_d44401cd1 ...
dedupe_key signal_enriched:news_delta:7d78b49b51816034
throttle_s 0
created_at 2026-04-10T03:46:52.327676+00:00
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