Delete row sig_8e83bffaa36c from signals

id sig_8e83bffaa36c
event_id evt_31149bdb494d
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T08:52:29.384145+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c77ecee6d626e704
throttle_s 0
created_at 2026-04-08T08:52:29.384145+00:00
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