Delete row sig_3bd2210ce134 from signals

id sig_3bd2210ce134
event_id evt_20406839c843
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T08:42:34.810484+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:0a721b4ea4d1b367
throttle_s 0
created_at 2026-04-20T08:42:34.810484+00:00
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