Delete row sig_bc13d8492986 from signals

id sig_bc13d8492986
event_id evt_fc4292387ac8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T13:14:29.890764+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8afdc168569c2d8a
throttle_s 0
created_at 2026-04-12T13:14:29.890764+00:00
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