Delete row sig_b344a4cd8290 from signals

id sig_b344a4cd8290
event_id evt_3112bfa66479
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T02:28:37.295672+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:10436f26955ac600
throttle_s 0
created_at 2026-04-20T02:28:37.295672+00:00
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