Delete row sig_3552ef6d7c9d from signals

id sig_3552ef6d7c9d
event_id evt_c1425488d652
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-10T00:40:10.999177+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b3d300b86d7c31cb
throttle_s 0
created_at 2026-04-10T00:40:10.999177+00:00
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