Delete row sig_21760ad2db37 from signals

id sig_21760ad2db37
event_id evt_fc5a41141070
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_dfa5c80f0 ...
dedupe_key signal_enriched:news_delta:7d23797828badec7
throttle_s 0
created_at 2026-04-20T00:32:36.041238+00:00
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