Delete row sig_b13e1b5dc90f from signals

id sig_b13e1b5dc90f
event_id evt_787f7171c800
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T13:54:15.305001+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:822d70607e4b14f7
throttle_s 0
created_at 2026-04-20T13:54:15.305001+00:00
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