Delete row sig_0b3adba5daa3 from signals

id sig_0b3adba5daa3
event_id evt_cbd7ea094d53
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-22T05:51:05.452831+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:bd34f7cf3a4e2539
throttle_s 0
created_at 2026-04-22T05:51:05.452831+00:00
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