Delete row sig_1cbd2e03ecaa from signals

id sig_1cbd2e03ecaa
event_id evt_da77d1e381d4
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_1b151c658 ...
dedupe_key signal_enriched:news_delta:f16fe20d6ec1eb90
throttle_s 0
created_at 2026-04-18T08:46:06.874139+00:00
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