Delete row sig_999a49169de4 from signals

id sig_999a49169de4
event_id evt_3094f1f8affb
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T05:27:52.645634+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:af25a027d72c912f
throttle_s 0
created_at 2026-04-10T05:27:52.645634+00:00
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