Delete row sig_bc574f669a6b from signals

id sig_bc574f669a6b
event_id evt_33f0606f8c9f
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_3a928905b ...
dedupe_key signal_enriched:news_delta:aa50d91361e73481
throttle_s 0
created_at 2026-04-19T01:31:58.378654+00:00
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