Delete row sig_05915635f519 from signals

id sig_05915635f519
event_id evt_5787e1b5e108
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_97d90b419 ...
dedupe_key signal_enriched:news_delta:978793b595bdbfcc
throttle_s 0
created_at 2026-04-11T16:31:47.427553+00:00
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