Delete row sig_08883bbed885 from signals

id sig_08883bbed885
event_id evt_05702f6df4cc
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T23:26:04.435196+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:05bc59ad3044c7d8
throttle_s 0
created_at 2026-04-12T23:26:04.435196+00:00
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