Delete row sig_7129e2d97046 from signals

id sig_7129e2d97046
event_id evt_d32b71063ed8
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T06:42:38.181750+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:528078b0cb15d8ef
throttle_s 0
created_at 2026-04-12T06:42:38.181750+00:00
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