Delete row sig_6becd6d44745 from signals

id sig_6becd6d44745
event_id evt_6f0dad1f7e8c
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_79016b468 ...
dedupe_key signal_enriched:news_delta:2fd7fa38ba8c3c2a
throttle_s 0
created_at 2026-04-08T21:48:34.563655+00:00
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