Delete row sig_172b981d5632 from signals

id sig_172b981d5632
event_id evt_35a9c28339ec
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_6943f4b66 ...
dedupe_key signal_enriched:news_delta:1a7353a0be139a7f
throttle_s 0
created_at 2026-04-09T22:31:38.221800+00:00
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