Delete row sig_6de1bd898a55 from signals

id sig_6de1bd898a55
event_id evt_a4ac116d40b4
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_a6a36deba ...
dedupe_key signal_enriched:news_delta:cc44aeb903bcac88
throttle_s 0
created_at 2026-04-20T14:50:32.535829+00:00
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