Delete row sig_6136fd2c8788 from signals

id sig_6136fd2c8788
event_id evt_a766d0577510
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_ecda4f6cc ...
dedupe_key signal_enriched:news_delta:4390ea92974d750d
throttle_s 0
created_at 2026-04-21T02:24:00.347803+00:00
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