Delete row sig_ebfc3f30c6a9 from signals

id sig_ebfc3f30c6a9
event_id evt_432d3aa70451
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_e7607929a ...
dedupe_key signal_enriched:news_delta:a56ee439f7eefcb7
throttle_s 0
created_at 2026-04-07T10:36:54.513562+00:00
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