Delete row sig_533db4283e23 from signals

id sig_533db4283e23
event_id evt_ca59be1c3795
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T11:56:13.744288+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:85360121aed5c727
throttle_s 0
created_at 2026-04-20T11:56:13.744288+00:00
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