Delete row sig_56ac5a71233e from signals

id sig_56ac5a71233e
event_id evt_bdce6c391450
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T07:36:58.332480+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bd2defa1d694cf9d
throttle_s 0
created_at 2026-04-22T07:36:58.332480+00:00
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