Delete row sig_00acff121422 from signals

id sig_00acff121422
event_id evt_0c7cc752401a
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-14T22:59:02.855119+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ec83874a0aae0fa0
throttle_s 0
created_at 2026-04-14T22:59:02.855119+00:00
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