Delete row sig_4e9f05cd369e from signals

id sig_4e9f05cd369e
event_id evt_dbb905d6ce4b
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_da62afa48 ...
dedupe_key signal_enriched:news_delta:67899c83657c7850
throttle_s 0
created_at 2026-04-09T03:06:54.978078+00:00
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