Delete row sig_0c42fd77887b from signals

id sig_0c42fd77887b
event_id evt_4ac87bc41ace
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_8f6d79184 ...
dedupe_key signal_enriched:news_delta:d07c9d258652641b
throttle_s 0
created_at 2026-04-13T14:10:13.402545+00:00
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