Delete row sig_54e7ab64f747 from signals

id sig_54e7ab64f747
event_id evt_15e557abf9fe
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T07:13:55.259403+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bd38b0845cfa48bd
throttle_s 0
created_at 2026-04-12T07:13:55.259403+00:00
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