Delete row sig_1a383edf16c7 from signals

id sig_1a383edf16c7
event_id evt_b3c2900cddc6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T04:56:30.759260+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:610ea0d213d2d529
throttle_s 0
created_at 2026-04-10T04:56:30.759260+00:00
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