Delete row sig_1821e0482b69 from signals

id sig_1821e0482b69
event_id evt_46e64e165975
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_26219f5db ...
dedupe_key signal_enriched:news_delta:a9bffdcebc042447
throttle_s 0
created_at 2026-04-19T16:31:08.993997+00:00
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