Delete row sig_516e09aaba1f from signals

id sig_516e09aaba1f
event_id evt_8debb6bb5cdb
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_06a37e87c ...
dedupe_key signal_enriched:news_delta:738c937c3e8fca21
throttle_s 0
created_at 2026-04-08T09:07:38.451953+00:00
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