Delete row sig_48cc2fff121f from signals

id sig_48cc2fff121f
event_id evt_bdce01b70d0e
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_31a4922c0 ...
dedupe_key signal_enriched:news_delta:7e2147f4149f3b56
throttle_s 0
created_at 2026-04-08T04:33:58.940458+00:00
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