Delete row sig_75cad359acb4 from signals

id sig_75cad359acb4
event_id evt_ea920d870234
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-15T04:58:22.397419+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9efe69578e649b68
throttle_s 0
created_at 2026-04-15T04:58:22.397419+00:00
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