Delete row sig_6b59bb42116f from signals

id sig_6b59bb42116f
event_id evt_ec455628717d
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_ea2bbc9a9 ...
dedupe_key signal_enriched:news_delta:e493ad67ac8c4d8f
throttle_s 0
created_at 2026-04-21T01:31:11.810054+00:00
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