Delete row sig_1cfdc7c8d79e from signals

id sig_1cfdc7c8d79e
event_id evt_00c17c9ca81b
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_25cc59af2 ...
dedupe_key signal_enriched:news_delta:5cd4ae5a6531a313
throttle_s 0
created_at 2026-04-20T09:59:19.919399+00:00
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