Delete row sig_0b2ca45bcbd6 from signals

id sig_0b2ca45bcbd6
event_id evt_6fc0d9ca6a66
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T11:35:53.327744+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a3baec708dbfc539
throttle_s 0
created_at 2026-04-22T11:35:53.327744+00:00
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