Delete row sig_6ce2aa260756 from signals

id sig_6ce2aa260756
event_id evt_3e11616e0573
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_e26794a38 ...
dedupe_key signal_enriched:news_delta:bc6459530e951b32
throttle_s 0
created_at 2026-04-22T10:14:41.791029+00:00
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