Delete row sig_388a9c2fe24a from signals

id sig_388a9c2fe24a
event_id evt_29fe7c37475f
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_73fca2190 ...
dedupe_key signal_enriched:news_delta:fcb7cde263f8a1f4
throttle_s 0
created_at 2026-04-07T23:23:37.638525+00:00
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