Delete row sig_4d6fcf4ea79f from signals

id sig_4d6fcf4ea79f
event_id evt_5de3dc95b626
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_499409adc ...
dedupe_key signal_enriched:news_delta:78a4f1c9ce419366
throttle_s 0
created_at 2026-04-22T04:56:34.629899+00:00
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