Delete row sig_1533e0356251 from signals

id sig_1533e0356251
event_id evt_0e9d630e6159
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_268139edb ...
dedupe_key signal_enriched:news_delta:d63ff507df741a6e
throttle_s 0
created_at 2026-04-19T06:39:15.451691+00:00
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