Delete row sig_607a3f78e057 from signals

id sig_607a3f78e057
event_id evt_a9a75831fc4f
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_4c2a2ade5 ...
dedupe_key signal_enriched:news_delta:75eb0e362182e5ce
throttle_s 0
created_at 2026-04-07T06:14:48.950225+00:00
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