Delete row sig_d1e11ff46864 from signals

id sig_d1e11ff46864
event_id evt_9a69d05f9855
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T13:21:18.645202+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4ce1d31bedc8f0bf
throttle_s 0
created_at 2026-04-20T13:21:18.645202+00:00
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