Delete row sig_626a631a2036 from signals

id sig_626a631a2036
event_id evt_8b519e78f63d
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_cb3fb0f77 ...
dedupe_key signal_enriched:news_delta:0441416f21e8da80
throttle_s 0
created_at 2026-04-10T20:50:30.444030+00:00
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