Delete row sig_a52b94897784 from signals

id sig_a52b94897784
event_id evt_e1c3c6d0b814
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_3cd90a8a6 ...
dedupe_key signal_enriched:news_delta:a10753e117c2d982
throttle_s 0
created_at 2026-04-19T12:01:22.896674+00:00
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