Delete row sig_d99034a88445 from signals

id sig_d99034a88445
event_id evt_84927ce82536
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T01:58:01.334046+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:82dceb5592ce684a
throttle_s 0
created_at 2026-04-22T01:58:01.334046+00:00
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