Delete row sig_1708399d75fd from signals

id sig_1708399d75fd
event_id evt_82b5f1a20efd
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T13:16:11.322611+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ae81b1778c709c53
throttle_s 0
created_at 2026-04-09T13:16:11.322611+00:00
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