Delete row sig_171d9099dec6 from signals

id sig_171d9099dec6
event_id evt_9488cee800a2
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_57e13ab28 ...
dedupe_key signal_enriched:news_delta:7ead98cea5533f0b
throttle_s 0
created_at 2026-04-09T23:49:34.864899+00:00
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