Delete row sig_2d7ca2393d3d from signals

id sig_2d7ca2393d3d
event_id evt_bd1520352e75
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T14:56:30.570331+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:d1bc311713f04578
throttle_s 0
created_at 2026-04-18T14:56:30.570331+00:00
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