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Market risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Statement [Line Items]    
Loans payable ¥ 0 ¥ 161,439
Convertible notes payable 12,922 10,011
Trade payable 1,302 0
Loan receivables   248,350
Trade receivable 12,568 0
Market risk [member]    
Statement [Line Items]    
Loan receivables 0 193,682
Trade receivable ¥ 12,568 ¥ 0