Delete row sig_bd4919cec91d from signals

id sig_bd4919cec91d
event_id evt_5ad5703282ce
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-16T13:42:45.591842+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2be1fed801fa5179
throttle_s 0
created_at 2026-04-16T13:42:45.591842+00:00
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