Delete row sig_b606c9be531e from signals

id sig_b606c9be531e
event_id evt_d9e298163324
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_8507d220b ...
dedupe_key signal_enriched:news_delta:cf480e8f03324080
throttle_s 0
created_at 2026-04-17T01:27:21.537227+00:00
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