Delete row sig_1d53f52fc691 from signals

id sig_1d53f52fc691
event_id evt_cce92901cab0
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T11:48:10.988033+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:c4d7d8abde99bc37
throttle_s 0
created_at 2026-04-11T11:48:10.988033+00:00
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