Delete row sig_53c40b664be3 from signals

id sig_53c40b664be3
event_id evt_00d4678db05c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T17:06:23.037191+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:6404947e59772e87
throttle_s 0
created_at 2026-04-09T17:06:23.037191+00:00
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