Delete row sig_71789f96d426 from signals

id sig_71789f96d426
event_id evt_798ec9df1758
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_4cc8fcbee ...
dedupe_key signal_enriched:news_delta:1645fdc07d76864c
throttle_s 0
created_at 2026-04-17T19:38:48.299823+00:00
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