Delete row sig_a6a01bcba2e6 from signals

id sig_a6a01bcba2e6
event_id evt_638fb0c1f428
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_967e18b19 ...
dedupe_key signal_enriched:news_delta:f9bdcc2d7e8ea436
throttle_s 0
created_at 2026-04-22T14:18:39.964981+00:00
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