Delete row sig_18d3fd2cb43c from signals

id sig_18d3fd2cb43c
event_id evt_ef94f209dc08
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T10:48:35.975146+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:142e7ae443919882
throttle_s 0
created_at 2026-04-08T10:48:35.975146+00:00
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