Delete row sig_9828ff338a7c from signals

id sig_9828ff338a7c
event_id evt_949991c53562
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_9dc989510 ...
dedupe_key signal_enriched:news_delta:d4d45f918f045049
throttle_s 0
created_at 2026-04-10T04:47:25.067949+00:00
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