Delete row sig_9f019b865906 from signals

id sig_9f019b865906
event_id evt_48a9dfb9a805
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_ae1ca4965 ...
dedupe_key signal_enriched:news_delta:db8095594b49e4b2
throttle_s 0
created_at 2026-04-13T12:39:41.580495+00:00
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