Delete row sig_a466bc735125 from signals

id sig_a466bc735125
event_id evt_61e86b5f57f8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-19T04:54:54.814609+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4e3d59f1e4ed6483
throttle_s 0
created_at 2026-04-19T04:54:54.814609+00:00
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