Delete row sig_1bec17a1e8f8 from signals

id sig_1bec17a1e8f8
event_id evt_068862318d0c
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_834075f60 ...
dedupe_key signal_enriched:news_delta:4895fd6c34f0d51f
throttle_s 0
created_at 2026-04-07T04:04:22.333000+00:00
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