Delete row sig_213169337f7a from signals

id sig_213169337f7a
event_id evt_5ecbf0364e1f
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_6791793ce ...
dedupe_key signal_enriched:news_delta:6d14638785a4cd5e
throttle_s 0
created_at 2026-04-19T18:00:49.542183+00:00
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