Delete row sig_475e14622387 from signals

id sig_475e14622387
event_id evt_5aae3ee35e13
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T10:10:43.343113+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a010d8e0290a583b
throttle_s 0
created_at 2026-04-20T10:10:43.343113+00:00
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