Assertion failed: data must be asc ordered by time

[bludnic]

Steps to reproduce:

1. Create a bot (e.g. with RSI strategy) with 1m timeframe
2. Open the bot page and start the bot
3. Switch to 1m chart
4. Disable internet connection at least for 2 minutes, to ensure we lost some candles
5. Restore internet connection

Related to lightweight-charts tradingview/lightweight-charts#1263 (comment).

Most likely, some candles were lost due to an unstable WebSocket connection. When the connection is restored and a new candle is received, it does create a gap in the chart data.

[bludnic]

Similar issue when using Bitget 5ba2daa, which is partially fixed. Normally, we need to normalize the data (avoid duplicate candles or fix gaps) from the exchange, as CCXT doesn't handle this.