Delete row sig_37977397b36b from signals

id sig_37977397b36b
event_id evt_0835dc7b1beb
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T06:31:33.825180+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0ec4b6d68bf4cbfa
throttle_s 0
created_at 2026-04-12T06:31:33.825180+00:00
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