Delete row sig_a8e72d19a820 from signals

id sig_a8e72d19a820
event_id evt_be46f78fce1c
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_ec4a49b0e ...
dedupe_key signal_enriched:news_delta:69f775779a7a7ccf
throttle_s 0
created_at 2026-04-08T10:08:15.490074+00:00
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