Delete row sig_d0d9b74c333d from signals

id sig_d0d9b74c333d
event_id evt_39dc457d4dcf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T13:37:19.928510+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:eea9f80568612a34
throttle_s 0
created_at 2026-04-22T13:37:19.928510+00:00
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