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Segment information and revenue - Revenue recognized in relation to contract liabilities (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment information and revenue      
Revenue recognized that was included in the contract liability balance at the beginning of the year ¥ 153,844 ¥ 138,547 ¥ 104,960