Delete row sig_586c1a124c8b from signals

id sig_586c1a124c8b
event_id evt_f9c5fad3b283
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T20:38:00.792660+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a9fd044e17866a16
throttle_s 0
created_at 2026-04-09T20:38:00.792660+00:00
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