Delete row sig_a1f775aa7023 from signals

id sig_a1f775aa7023
event_id evt_a44ad72f983e
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_eae3edce2 ...
dedupe_key signal_enriched:news_delta:cdeba132f74c191d
throttle_s 0
created_at 2026-04-21T07:00:36.892640+00:00
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