Delete row sig_39dc68613e3d from signals

id sig_39dc68613e3d
event_id evt_c2e7e43a01c9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T10:59:41.152618+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d8df84de2dc7ef23
throttle_s 0
created_at 2026-04-08T10:59:41.152618+00:00
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