Delete row sig_2cec6aaf4694 from signals

id sig_2cec6aaf4694
event_id evt_f90d0c3b0fc2
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_6c8a054bd ...
dedupe_key signal_enriched:news_delta:32dbfee4d5e168ab
throttle_s 0
created_at 2026-04-08T23:28:56.811943+00:00
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