Delete row sig_6c8b7111aa2b from signals

id sig_6c8b7111aa2b
event_id evt_cfc3bfc470e5
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_444f5d59d ...
dedupe_key signal_enriched:news_delta:2ca649d15d35205e
throttle_s 0
created_at 2026-04-10T18:06:51.555641+00:00
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