Delete row sig_641e49226296 from signals

id sig_641e49226296
event_id evt_e13a61892da6
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_97c2ce174 ...
dedupe_key signal_enriched:news_delta:4531aff97f3675ec
throttle_s 0
created_at 2026-04-10T17:15:05.629744+00:00
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