Delete row sig_506a11bf0643 from signals

id sig_506a11bf0643
event_id evt_78204258d079
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_85f7f1caf ...
dedupe_key signal_enriched:news_delta:d6efd397d15b8c6d
throttle_s 0
created_at 2026-04-20T08:28:27.221209+00:00
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