Delete row sig_cb4dd3037133 from signals

id sig_cb4dd3037133
event_id evt_13a28873937c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T09:33:00.105472+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:413abed99dc1ea9e
throttle_s 0
created_at 2026-04-14T09:33:00.105472+00:00
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