Delete row sig_dd2f971cf418 from signals

id sig_dd2f971cf418
event_id evt_30164baea160
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_48c3f0441 ...
dedupe_key signal_enriched:news_delta:2f3169d9903ec143
throttle_s 0
created_at 2026-04-09T19:28:45.875887+00:00
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