Delete row sig_251c7714a50d from signals

id sig_251c7714a50d
event_id evt_f8a72eefde84
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T13:46:49.301616+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ff8406b0df97cead
throttle_s 0
created_at 2026-04-12T13:46:49.301616+00:00
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