Delete row sig_dfe678137a86 from signals

id sig_dfe678137a86
event_id evt_477a143f3e12
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_2fd123241 ...
dedupe_key signal_enriched:news_delta:3739cd7da2554bdb
throttle_s 0
created_at 2026-04-20T11:31:01.459709+00:00
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