Delete row sig_b4a6c2bb84f9 from signals

id sig_b4a6c2bb84f9
event_id evt_bc884f7a6b81
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_faf1cae03 ...
dedupe_key signal_enriched:news_delta:0724fbf6e929d65e
throttle_s 0
created_at 2026-04-19T21:38:49.612107+00:00
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