Delete row sig_72efcfb83201 from signals

id sig_72efcfb83201
event_id evt_9ab60b377544
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T22:34:17.976467+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8864a18f86cb4052
throttle_s 0
created_at 2026-04-11T22:34:17.976467+00:00
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