Delete row sig_5b510c779b44 from signals

id sig_5b510c779b44
event_id evt_141ce47c1444
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_00e110d3b ...
dedupe_key signal_enriched:news_delta:1b9a662ad58a2cb2
throttle_s 0
created_at 2026-04-19T18:38:57.072370+00:00
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