Delete row sig_9cb54fa9afb2 from signals

id sig_9cb54fa9afb2
event_id evt_0e8ef1509f00
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_5f194a053 ...
dedupe_key signal_enriched:news_delta:b1b17a2b57313222
throttle_s 0
created_at 2026-04-22T11:31:53.852398+00:00
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