Delete row sig_0c27e9085946 from signals

id sig_0c27e9085946
event_id evt_838c689aa54c
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_86f8d3290 ...
dedupe_key signal_enriched:news_delta:188dabac7b1d23a1
throttle_s 0
created_at 2026-04-21T16:42:29.628452+00:00
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