Delete row sig_8453bcf68af5 from signals

id sig_8453bcf68af5
event_id evt_488d7faa2311
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-20T10:43:35.602467+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:9462d725a95662f8
throttle_s 0
created_at 2026-04-20T10:43:35.602467+00:00
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