Delete row sig_1db4883b6fc8 from signals

id sig_1db4883b6fc8
event_id evt_3d7949003ca0
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_0787eed36 ...
dedupe_key signal_enriched:news_delta:146e48383f153ae4
throttle_s 0
created_at 2026-04-09T03:57:11.964706+00:00
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