Delete row sig_cb2cca691549 from signals

id sig_cb2cca691549
event_id evt_07e81e6c71f2
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T02:28:17.040482+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0aaead3170b04a6d
throttle_s 0
created_at 2026-04-10T02:28:17.040482+00:00
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