Delete row sig_3126def3bfe9 from signals

id sig_3126def3bfe9
event_id evt_6052f81aef2c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T13:32:05.493796+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:33c5c85a8d759dde
throttle_s 0
created_at 2026-04-20T13:32:05.493796+00:00
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