Delete row sig_d70f1fb4374b from signals

id sig_d70f1fb4374b
event_id evt_b9eb048a49df
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_82824edb5 ...
dedupe_key signal_enriched:news_delta:28e3bc6d467384c8
throttle_s 0
created_at 2026-04-09T09:54:21.062026+00:00
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