Delete row sig_4250f79fc7db from signals

id sig_4250f79fc7db
event_id evt_0d2fd8f6c1d0
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_d14fe4fdd ...
dedupe_key signal_enriched:news_delta:dd88a77a4fd5faf9
throttle_s 0
created_at 2026-04-20T13:18:59.892985+00:00
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