Delete row sig_be6cb185691d from signals

id sig_be6cb185691d
event_id evt_c2bfde547933
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_6b753c089 ...
dedupe_key signal_enriched:news_delta:0abd24f1b5250e38
throttle_s 0
created_at 2026-04-20T17:14:49.997837+00:00
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