Delete row sig_ef088502082e from signals

id sig_ef088502082e
event_id evt_56d417941812
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T22:35:47.674214+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:4d617c87b61e8dfd
throttle_s 0
created_at 2026-04-12T22:35:47.674214+00:00
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