Delete row sig_4a6f5b9640c0 from signals

id sig_4a6f5b9640c0
event_id evt_2f718fdb88cc
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_18fdf5c28 ...
dedupe_key signal_enriched:news_delta:da7a67f396b73b0b
throttle_s 0
created_at 2026-04-18T13:34:52.660817+00:00
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