Delete row sig_ef6cf55805a6 from signals

id sig_ef6cf55805a6
event_id evt_20b2cf01b648
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_91ccf35bf ...
dedupe_key signal_enriched:news_delta:cd9a489e1c99453a
throttle_s 0
created_at 2026-04-18T18:03:45.158753+00:00
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