Delete row sig_b4a729fd8493 from signals

id sig_b4a729fd8493
event_id evt_d3c340131e38
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T09:52:41.437770+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:487eea0edea52c2e
throttle_s 0
created_at 2026-04-18T09:52:41.437770+00:00
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