Delete row sig_cccf5f418434 from signals

id sig_cccf5f418434
event_id evt_a195cdbaac54
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_5eb57e38a ...
dedupe_key signal_enriched:news_delta:f7d8292925f1fbc4
throttle_s 0
created_at 2026-04-19T23:16:50.963955+00:00
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