Delete row sig_7157513f3c63 from signals

id sig_7157513f3c63
event_id evt_1486652bf573
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-09T23:37:45.543380+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:86bf23f5c9e60573
throttle_s 0
created_at 2026-04-09T23:37:45.543380+00:00
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