Delete row sig_522d1026b3a6 from signals

id sig_522d1026b3a6
event_id evt_f518a0046cd6
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_c9dc07f44 ...
dedupe_key signal_enriched:news_delta:46c49b1f4cb16d60
throttle_s 0
created_at 2026-04-22T12:32:25.093913+00:00
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