Delete row sig_ca28c6d76994 from signals

id sig_ca28c6d76994
event_id evt_8f30e035c296
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_ecb165c0e ...
dedupe_key signal_enriched:news_delta:cbb121ff94d72827
throttle_s 0
created_at 2026-04-19T00:02:36.175041+00:00
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