Delete row sig_57136bab7b8a from signals

id sig_57136bab7b8a
event_id evt_bf55fb16492e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T23:52:50.280210+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:77c04a11b16147ff
throttle_s 0
created_at 2026-04-08T23:52:50.280210+00:00
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