Delete row sig_31318ddf68e4 from signals

id sig_31318ddf68e4
event_id evt_dd0ab6b0add3
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T09:04:54.751922+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e506ab3d191e76da
throttle_s 0
created_at 2026-04-10T09:04:54.751922+00:00
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