Delete row sig_f39274668fa7 from signals

id sig_f39274668fa7
event_id evt_950f15f97f8a
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_8e0136c52 ...
dedupe_key signal_enriched:news_delta:f47eafd6ad613527
throttle_s 0
created_at 2026-04-19T01:31:58.390642+00:00
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