Delete row sig_38ee42997581 from signals

id sig_38ee42997581
event_id evt_85ec2a0d3b07
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T23:17:10.425826+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:52e50f0494be987b
throttle_s 0
created_at 2026-04-09T23:17:10.425826+00:00
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