Delete row sig_9e0ed91d492d from signals

id sig_9e0ed91d492d
event_id evt_c8c7704d98ed
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_18e9498a5 ...
dedupe_key signal_enriched:news_delta:5bf766cced9e269d
throttle_s 0
created_at 2026-04-19T22:16:21.527821+00:00
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