Delete row sig_9ba03113af2d from signals

id sig_9ba03113af2d
event_id evt_9c179c5b83b5
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_45c4a23f1 ...
dedupe_key signal_enriched:news_delta:ecbdaa4160cefdc6
throttle_s 0
created_at 2026-04-08T08:52:34.219060+00:00
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