Delete row sig_b1ddea894e1b from signals

id sig_b1ddea894e1b
event_id evt_d1bd2d7cbaf3
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T10:19:35.038871+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:46402eb891fe6439
throttle_s 0
created_at 2026-04-10T10:19:35.038871+00:00
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