Delete row sig_be1510a5f26e from signals

id sig_be1510a5f26e
event_id evt_bf3b748f02a3
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_2ffe5cd12 ...
dedupe_key signal_enriched:news_delta:cecf0263f3926e41
throttle_s 0
created_at 2026-04-21T11:29:33.927987+00:00
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