Delete row sig_0956b2dff3d9 from signals

id sig_0956b2dff3d9
event_id evt_aedc97ef89d4
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T00:08:58.832797+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:294ebf94bfa4fabe
throttle_s 0
created_at 2026-04-10T00:08:58.832797+00:00
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