Delete row sig_b7bcbc1dc4ca from signals

id sig_b7bcbc1dc4ca
event_id evt_2a0bf11114ce
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T01:04:30.079041+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:5da62809bc486708
throttle_s 0
created_at 2026-04-22T01:04:30.079041+00:00
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