Delete row sig_d66351b6c9ee from signals

id sig_d66351b6c9ee
event_id evt_428e130efaa8
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_c0f9d71c1 ...
dedupe_key signal_enriched:news_delta:c1696c59140f01e8
throttle_s 0
created_at 2026-04-22T13:17:57.044508+00:00
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