Delete row sig_9d2192aba95e from signals

id sig_9d2192aba95e
event_id evt_bfe1f578d26c
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_b23ab7357 ...
dedupe_key signal_enriched:news_delta:f77466cca00ed96b
throttle_s 0
created_at 2026-04-21T16:42:29.577683+00:00
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