Delete row sig_1acda2444047 from signals

id sig_1acda2444047
event_id evt_9bd5f5c56afa
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-06T22:14:59.551796+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ca31225400126c93
throttle_s 0
created_at 2026-04-06T22:14:59.551796+00:00
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