Delete row sig_324032345c39 from signals

id sig_324032345c39
event_id evt_20faab5ed043
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-13T15:24:53.577685+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2c5b52a74061c0d3
throttle_s 0
created_at 2026-04-13T15:24:53.577685+00:00
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