Delete row sig_d0f1f639cb82 from signals

id sig_d0f1f639cb82
event_id evt_72cc7f0bb059
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T13:15:09.980524+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:80e5b22852bec1a2
throttle_s 0
created_at 2026-04-22T13:15:09.980524+00:00
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