Delete row sig_9ce249475bc2 from signals

id sig_9ce249475bc2
event_id evt_15a406db2fe4
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_4c347dd01 ...
dedupe_key signal_enriched:news_delta:c69e035a0dbe7ee9
throttle_s 0
created_at 2026-04-07T04:04:22.074037+00:00
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