Delete row sig_668828d277e5 from signals

id sig_668828d277e5
event_id evt_1336fef7a50e
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_156d9a048 ...
dedupe_key signal_enriched:news_delta:165877bbc924b465
throttle_s 0
created_at 2026-04-09T15:51:38.289148+00:00
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