Delete row sig_64733cea7b7c from signals

id sig_64733cea7b7c
event_id evt_6422e84051cf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T02:11:49.919448+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0485f08bb4441a3b
throttle_s 0
created_at 2026-04-11T02:11:49.919448+00:00
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