Delete row sig_420ff4ee4863 from signals

id sig_420ff4ee4863
event_id evt_aabfc8507c3a
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_5e4cc021c ...
dedupe_key signal_enriched:news_delta:5f24c4dfc2a33064
throttle_s 0
created_at 2026-04-12T11:08:13.855560+00:00
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