Delete row sig_d469bc8e0a61 from signals

id sig_d469bc8e0a61
event_id evt_4c5ae2e250d0
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_5e7e921cf ...
dedupe_key signal_enriched:news_delta:2f3669048cfe9273
throttle_s 0
created_at 2026-04-21T14:34:18.161495+00:00
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