Delete row sig_bf51f33b5191 from signals

id sig_bf51f33b5191
event_id evt_fc97f45cc47c
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-21T12:05:20.473992+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:2d08b6aa0a950730
throttle_s 0
created_at 2026-04-21T12:05:20.473992+00:00
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