Delete row sig_9bd6fb66d318 from signals

id sig_9bd6fb66d318
event_id evt_a4fec8c45980
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_cbd09618b ...
dedupe_key signal_enriched:news_delta:d81f458c72d932ec
throttle_s 0
created_at 2026-04-19T23:16:50.788587+00:00
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