Delete row sig_528965132048 from signals

id sig_528965132048
event_id evt_6a984babbf88
watcher_id NULL
signal_type market_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {"_evidence_event_ids":["evt_130ac4f67 ...
dedupe_key signal_enriched:market_headline_delta:cbff541b551a ...
throttle_s 0
created_at 2026-04-10T04:04:05.210287+00:00
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