Delete row sig_906b3ba18ff0 from signals

id sig_906b3ba18ff0
event_id evt_2fdfa4d4489f
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_95f861d01 ...
dedupe_key signal_enriched:news_delta:fc31c2c08eae5eb7
throttle_s 0
created_at 2026-04-19T22:16:21.616885+00:00
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