Delete row sig_4d85798d9460 from signals

id sig_4d85798d9460
event_id evt_1502d55542bc
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T20:36:08.647129+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e60cbcdcd599f019
throttle_s 0
created_at 2026-04-10T20:36:08.647129+00:00
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