Delete row sig_9b573f30e5cd from signals

id sig_9b573f30e5cd
event_id evt_b7007d1cf766
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T09:27:07.866823+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9a8de483a0b3cbd1
throttle_s 0
created_at 2026-04-10T09:27:07.866823+00:00
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