Delete row sig_c3665cab399d from signals

id sig_c3665cab399d
event_id evt_b1ad8bf8ca31
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_0d989362d ...
dedupe_key signal_enriched:news_delta:1628ac757f46f05b
throttle_s 0
created_at 2026-04-21T10:00:50.836406+00:00
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