Delete row sig_500f0d9cd60a from signals

id sig_500f0d9cd60a
event_id evt_9f560368b397
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_928ed1b52 ...
dedupe_key signal_enriched:news_delta:1b4bbdd1ce93f759
throttle_s 0
created_at 2026-04-12T22:11:41.822997+00:00
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