Delete row sig_b1c65ac77b1f from signals

id sig_b1c65ac77b1f
event_id evt_f0dfa77ca57f
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T04:40:03.199775+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d91bb2f0d15c71df
throttle_s 0
created_at 2026-04-08T04:40:03.199775+00:00
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