Delete row sig_5cc75ba7076f from signals

id sig_5cc75ba7076f
event_id evt_baa9d3f30169
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_c60d00ac3 ...
dedupe_key signal_enriched:news_delta:905fd0c1cb733f15
throttle_s 0
created_at 2026-04-22T13:02:42.785225+00:00
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