Delete row sig_15ae23372165 from signals

id sig_15ae23372165
event_id evt_e44a44beac24
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T13:35:43.155153+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:92bc2179d7bd0121
throttle_s 0
created_at 2026-04-12T13:35:43.155153+00:00
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