Delete row sig_a53066667dbb from signals

id sig_a53066667dbb
event_id evt_4742f37815cf
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_2cce6badb ...
dedupe_key signal_enriched:news_delta:9b1423aa083e8071
throttle_s 0
created_at 2026-04-20T12:17:04.477716+00:00
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