Delete row sig_c10091ca31d9 from signals

id sig_c10091ca31d9
event_id evt_35bd60f96613
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_fdb12e0f5 ...
dedupe_key signal_enriched:news_delta:e619487fc28bfb6e
throttle_s 0
created_at 2026-04-22T04:26:15.433352+00:00
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