Delete row sig_cb22ec540abc from signals

id sig_cb22ec540abc
event_id evt_e44e27add89e
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T23:05:54.869350+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:7416b46465a01bd2
throttle_s 0
created_at 2026-04-09T23:05:54.869350+00:00
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