Delete row sig_e68b24437616 from signals

id sig_e68b24437616
event_id evt_a36e2ccfdc07
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T23:47:56.461452+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:e018cf3de0d08c20
throttle_s 0
created_at 2026-04-11T23:47:56.461452+00:00
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