Delete row sig_0dc2126126dd from signals

id sig_0dc2126126dd
event_id evt_9aed12c843fb
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_d41f8ae5f ...
dedupe_key signal_enriched:news_delta:f0e780a818f2e342
throttle_s 0
created_at 2026-04-09T10:33:00.597187+00:00
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