Delete row sig_c5ff20809d41 from signals

id sig_c5ff20809d41
event_id evt_9b0de5114457
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_fd4d0ff9d ...
dedupe_key signal_enriched:news_delta:ecafef32a08f8e4b
throttle_s 0
created_at 2026-04-22T13:33:25.840581+00:00
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