Delete row sig_9ba50f360696 from signals

id sig_9ba50f360696
event_id evt_db7a8f84bfa8
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_a1a8c6db9 ...
dedupe_key signal_enriched:news_delta:37466d33eb3846af
throttle_s 0
created_at 2026-04-15T09:41:49.844762+00:00
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