Delete row sig_d9c074b755f1 from signals

id sig_d9c074b755f1
event_id evt_505e1863aaa8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T13:43:23.062664+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:274afa06ae22b6f0
throttle_s 0
created_at 2026-04-10T13:43:23.062664+00:00
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