Delete row sig_85c8599d214b from signals

id sig_85c8599d214b
event_id evt_9a0e71e4d453
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T05:33:36.661698+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:8cac263f5c27013e
throttle_s 0
created_at 2026-04-08T05:33:36.661698+00:00
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