Delete row sig_c010140580a9 from signals

id sig_c010140580a9
event_id evt_d903fd2f75c9
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T22:55:26.024563+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:153c62ac3d4f1579
throttle_s 0
created_at 2026-04-11T22:55:26.024563+00:00
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