Delete row sig_8cbd1d002fbd from signals

id sig_8cbd1d002fbd
event_id evt_aa7b6f839f71
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T14:21:05.249890+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:1637807da657b386
throttle_s 0
created_at 2026-04-22T14:21:05.249890+00:00
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