Delete row sig_223af90d9d04 from signals

id sig_223af90d9d04
event_id evt_30bf714f8655
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T09:59:23.779995+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:630bcacea9809c34
throttle_s 0
created_at 2026-04-10T09:59:23.779995+00:00
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