Delete row sig_5cc8d1f3bac8 from signals

id sig_5cc8d1f3bac8
event_id evt_36c0d9143f1a
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_1ff16c718 ...
dedupe_key signal_enriched:news_delta:46e1f5cdb983b4a1
throttle_s 0
created_at 2026-04-20T14:50:32.635740+00:00
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