Delete row sig_44ebcfdc485f from signals

id sig_44ebcfdc485f
event_id evt_f21eb6a1c7db
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_52b9e792f ...
dedupe_key signal_enriched:news_delta:3aafa160996a99b3
throttle_s 0
created_at 2026-04-20T05:07:23.037839+00:00
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