Delete row sig_22775269c49b from signals

id sig_22775269c49b
event_id evt_2966aa8ab044
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T08:46:43.461292+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:dcafcb71d159bd43
throttle_s 0
created_at 2026-04-19T08:46:43.461292+00:00
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