Delete row sig_427ac5841ec8 from signals

id sig_427ac5841ec8
event_id evt_fe20a6de8a4e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T13:58:56.782962+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cc26c24243c012b5
throttle_s 0
created_at 2026-04-10T13:58:56.782962+00:00
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