Delete row sig_83273c7eaac2 from signals

id sig_83273c7eaac2
event_id evt_1400f3eb551d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T22:10:59.884368+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:62f4f8776ae8608f
throttle_s 0
created_at 2026-04-09T22:10:59.884368+00:00
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