Delete row sig_1420b5bc14fc from signals

id sig_1420b5bc14fc
event_id evt_deb98e1387ce
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_0dafa4d5b ...
dedupe_key signal_enriched:news_delta:f97cb4e7206345dd
throttle_s 0
created_at 2026-04-09T22:31:38.760600+00:00
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