Delete row sig_b8ba14a28458 from signals

id sig_b8ba14a28458
event_id evt_eeba920dfebf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T02:49:20.831033+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:cc4942703c28c197
throttle_s 0
created_at 2026-04-10T02:49:20.831033+00:00
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