Delete row sig_4b1ae6a8640e from signals

id sig_4b1ae6a8640e
event_id evt_1e0c73ce1694
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_d105edb1b ...
dedupe_key signal_enriched:news_delta:239cbf481a467dc9
throttle_s 0
created_at 2026-04-06T15:00:06.787099+00:00
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