Delete row sig_21f8ad8b5c2d from signals

id sig_21f8ad8b5c2d
event_id evt_bf9a492007cf
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_79f00ee2f ...
dedupe_key signal_enriched:news_delta:031b360f38a9d776
throttle_s 0
created_at 2026-04-19T01:31:58.350720+00:00
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