Delete row sig_b570ba3bd8c0 from signals

id sig_b570ba3bd8c0
event_id evt_feb8ff4cceb9
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_5b94d0298 ...
dedupe_key signal_enriched:news_delta:2b8639b54ddac59e
throttle_s 0
created_at 2026-04-20T14:50:32.647233+00:00
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