Delete row sig_dd1b926d2f64 from signals

id sig_dd1b926d2f64
event_id evt_fc635697c4d9
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_79294b00a ...
dedupe_key signal_enriched:news_delta:b5caf7c77fd67672
throttle_s 0
created_at 2026-04-20T19:26:44.238657+00:00
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