shokollm 384f84e772 fix: fetch klines synchronously so chart shows immediately
The simulation engine completes in seconds, but the background task wasn't
saving klines to DB. Now we fetch klines first synchronously so the user
can see the price chart immediately after starting a simulation.

Also marks any stuck 'running' simulations as 'stopped'.
2026-04-12 03:18:42 +00:00
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