Delete row sig_acda41594afd from signals

id sig_acda41594afd
event_id evt_8eb3cc16e534
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-03T17:42:59.256570+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:f1495374f90e6948
throttle_s 0
created_at 2026-04-03T17:42:59.256570+00:00
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