Delete row sig_23dcd480237f from signals

id sig_23dcd480237f
event_id evt_0dd2a4a8f9db
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T05:29:22.189290+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:830fbed375371a49
throttle_s 0
created_at 2026-04-18T05:29:22.189290+00:00
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