Delete row sig_6c1b8225d104 from signals

id sig_6c1b8225d104
event_id evt_a809c8a8a861
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_4f32fd720 ...
dedupe_key signal_enriched:news_delta:53a72268f1410916
throttle_s 0
created_at 2026-04-10T09:20:02.808498+00:00
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